WO2009025760A2 - Compositions of prokaryotic phenylalanine ammonia-lyase and methods of treating cancer using compositions thereof - Google Patents
Compositions of prokaryotic phenylalanine ammonia-lyase and methods of treating cancer using compositions thereof Download PDFInfo
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- WO2009025760A2 WO2009025760A2 PCT/US2008/009765 US2008009765W WO2009025760A2 WO 2009025760 A2 WO2009025760 A2 WO 2009025760A2 US 2008009765 W US2008009765 W US 2008009765W WO 2009025760 A2 WO2009025760 A2 WO 2009025760A2
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- avpal
- pal
- variant
- cancer
- phenylalanine
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Definitions
- This invention relates to prokaryotic phenylalanine ammonia-lyase (PAL) and compositions thereof, and optimization of such compositions to enhance prokaryotic PAL catalytic activity and/or stability, while reducing immunogenicity and/or proteolytic sensitivity of prokaryotic PAL.
- the invention further relates to the use of such optimal compositions of prokaryotic PAL for treating cancer.
- PAL is a non-mammalian enzyme widely distributed in plants (Koukol, et al, J. Biol. Chem. 236:2692-2698 (1961); Hanson, et al, The Enzymes 7:75-166 (1972); Poppe, et al, Curr. Org. Chem. 7: 1297-1315 (2003)), some fungi (Rao, et al, Can. J. Biochem. 4512:1863-1872 (1967); Abell, et al, Methods Enzymol. 142:242-253 (1987)) and bacteria (Bezanson, et al, Can. J. Microbiol. 16:147-151 (1970); Xiang, et al, J. Biol. Chem. 277:32505-32509 (2002); Hill, et al, Chem. Commun. 1358-1359 (2003)) and can be recombinantly produced in Escherichia coli.
- a representative list of PALs includes: Q9ATN7 Agastache rugosa; 093967 Amanita muscaria (Fly agaric); P35510, P45724, P45725, Q9SS45, Q8RWP4 Arabidopsis thaliana (Mouse-ear cress); Q6ST23 Bambusa oldhamii (Giant timber bamboo); Q42609 Bromheadia finlaysoniana (Orchid); P45726 Camellia sinensis (Tea); Q9MAX1 Catharanthus roseus (Rosy periwinkle) (Madagascar periwinkle); Q9SMK9 Cicer arietinum (Chickpea); Q9XFX5, Q9XFX6 Citrus Clementina x Citrus reticulate; Q42667 Citrus limon (Lemon); Q8H6V9, Q8H6W0 Coffea canephora (Robusta coffee); Q
- PAL-mediated reduction in phenylalanine prevented the proliferation of murine leukemia and metastatic melanoma.
- intravenously injected pegylated PAL was cleared rapidly from circulating blood after the 13th injection (Abell, et al, Cancer Res. 33:2529-2532 (1973); Roberts, et al, (1976), ibid; Shen, et al, (1977), ibid; (Shen, et al, J. Reticuloendothelial Soc. 23:167-175 (1978)).
- Certain neoplastic or cancer cells have a higher metabolic rate and a greater requirement than normal cells for essential amino acids such as phenylalanine.
- restriction or reduction of specific amino acids e.g., phenylalanine
- amino acid degrading enzymes e.g., PAL
- certain leukemic cells lack the enzyme asparagine synthetase, which synthesizes the nonessential amino acid asparagine from glutamine, and are thus dependent upon asparagine for survival.
- Oncaspar pegaspargase, Enzon Pharmaceuticals, Inc.
- a pegylated L-asparaginase has been used successfully to treat acute lymphoblastic leukemia (ALL) (Graham, Adv. Drug Del. Rev. 55:1293-1302 (2003)).
- amino acids as potential targets for enzymatic depletion in cancer therapy include glutamine (glutamine deaminase, Medical Enzymes AG), arginine (arginine deiminase, Phoenix Pharmacologies, Inc.) and methionine (methioninase, Anticancer, Inc.) (See, for example, U.S. Patent Nos. 6,312,939, 6,737,259 and 5,690,929).
- RtPAL has been pegylated in an attempt to reduce the enzyme's immunogenicity and clearance rate in vivo (Wieder, et al, J. Biol. Chem. 254:12579-12587 (1979)). After a single intravenous injection or after multiple intravenous injections into mice, the blood half- life of pegylated RtPAL was longer than unpegylated RtPAL; however, the pegylated RtPAL was still rapidly cleared from the blood after the thirteenth intravenous injection.
- PAL potentially has various therapeutic applications
- the use of PAL may be limited by reduced specific activity and proteolytic instability. Similar to other therapeutic proteins, use of PAL as an enzyme therapy is accompanied by several disadvantages such as immunogenicity and proteolytic sensitivity (see Vellard, Curr. Opin. Biotechnol. 14:1-7 (2003)). As yet, a concerted effort toward improving these parameters has not been made due to a paucity of structural and biochemical knowledge regarding this protein.
- the invention is based on the finding that prokaryotic or bacterial PAL may serve as an effective treatment for cancer.
- the invention contemplates compositions of prokaryotic PAL and biologically active fragments, mutants, variants or analogs thereof, with enhanced properties, such as more potent catalytic activity, greater biochemical stability and, for therapeutic applications, attenuated immunogenicity and/or greater biological half-life.
- the invention provides pharmaceutical compositions and formulations comprising prokaryotic PAL and biologically active fragments, mutants, variants or analogs thereof and a pharmaceutically acceptable carrier, including stabilizers.
- the present invention also provides methods of production and purification of prokaryotic PAL and biologically active fragments, mutants, variants or analogs thereof, and methods of using such compositions for therapeutic purposes, including the treatment of neoplastic disease and cancer.
- bacterial PAL and “prokaryotic PAL” are used interchangeably to mean (1) wild-type PAL from a prokaryotic organism, including but not limited to PAL from Streptomyces maritimus (also known as EncP, SEQ ID NO: 5, FIGURE 4), Nostoc punctiforme (SEQ ID NO:2, FIGURE 4), Anabaena variabilis (SEQ ID NO:4, FIGURE 4), Anacystis nidulans (Lofflehardt, Z. Naturforsch.
- any references to methods of making or using prokaryotic PAL, and fragments, mutants, variants, analogs or chemically modified versions thereof, and compositions of such enzyme(s), for therapeutic purposes are meant to refer to methods of making, using or formulating all such wild-type prokaryotic PAL or fragments, mutants, variants, analogs or chemical modifications thereof.
- the present invention provides pharmaceutical compositions comprising bacterial PAL and biologically active fragments, mutants, variants or analogs thereof, and a pharmaceutically acceptable carrier.
- a preferred embodiment is a bacterial PAL from Nostoc punctiforme (SEQ ID NO:2) or biologically active fragment, mutant, variant or analog thereof.
- Another preferred embodiment is a bacterial PAL from Anabaena variabilis (SEQ ID NO:4) or biologically active fragment, mutant, variant or analog thereof.
- the invention contemplates prokaryotic PAL variants that have greater phenylalanine- converting activity and/or reduced immunogenicity as compared to a wild-type PAL.
- the prokaryotic PAL variants retain the wild-type active site residues at positions corresponding to Ser210, Ala-Ser-Gly triad (211-213), Asp214, Leu215, Asn270, Val269, Leu266, Leul34, His 137, Lys468, Glu496, Gln500 in PAL from Rhodosporidium toruloides PAL (RtPAL) or conservative substitution(s) of these active site residue(s), of which the Ala-Ser-Gly triad at 211-213 is believed to be the binding site for phenylalanine.
- RtPAL Rhodosporidium toruloides PAL
- Desirable prokaryotic PAL variants may include proteins in which one or more amino acid residues have been substituted by another amino acid residue to reduce protein aggregation that can be associated with decreased enzyme activity, increased immunogenicity, and/or other disadvantageous effects, such as reduced bioavailability, in vivo.
- the invention contemplates a pharmaceutical composition wherein one or more amino acid residues of the prokaryotic PAL variant have been substituted by another amino acid wherein the substitution increases phenylalanine-converting activity and/or reduces immunogenicity as compared to the wild-type PAL.
- one or more amino acid residues of the prokaryotic PAL variant have been substituted by another amino acid residue.
- one or more cysteine residues of the prokaryotic PAL variant have been substituted by a serine residue.
- the prokaryotic PAL variant is an Anabaena variabilis PAL (AvPAL).
- AvPAL Anabaena variabilis PAL
- one or more cysteine residues of the AvPAL variant have been substituted by a serine residue selected from the group consisting of cysteine residues at positions 64, 318, 503 and 565.
- the cysteine residue at position 565 of the AvPAL variant has been substituted by a serine residue.
- the cysteine residues at positions 503 and 565 of the AvPAL variant have been substituted by serine residues.
- Desirable prokaryotic PAL variants may include fusion proteins in which the PAL enzyme has been fused to another heterologous polypeptide, such as a native or modified constant region of an immunoglobulin or a fragment thereof that retains the salvage epitope, known in the art to increase half-life, or is recognized by proteins specific to particular forms of cancer.
- another heterologous polypeptide such as a native or modified constant region of an immunoglobulin or a fragment thereof that retains the salvage epitope, known in the art to increase half-life, or is recognized by proteins specific to particular forms of cancer.
- the invention further contemplates chemically modified versions of such prokaryotic PAL polypeptides, which have been linked to a chemical moiety that provides other advantageous effects.
- nonspecific or site-specific (e.g., N-terminal) linkage of water-soluble polymers, e.g., polyethylene glycol, to polypeptides is known in the art to improve half-life, and linkage of chemical moieties may also reduce immunogenicity and/or improve protease resistance.
- the prokaryotic PAL variant comprises a water-soluble polymer.
- the prokaryotic PAL variant comprises polyethylene glycol.
- the prokaryotic PAL variant is an Anabaena variabilis PAL (AvPAL) and the ratio of AvPAL and polyethylene glycol is about 1 :3 (1 :3 AvPAL:PEG).
- the prokaryotic PAL variant is an AvPAL variant, the ratio of the AvPAL variant and polyethylene glycol is about 1:3 (1 :3 AvPALrPEG), and the cysteine residues at positions 503 and 565 of the AvPAL variant have been substituted by serine residues.
- one or more amino acid residues of the prokaryotic PAL variant have been substituted by a lysine residue.
- the pegylation of an additional lysine residue(s) in a prokaryotic PAL variant can result in an enzyme that has reduced immunogenicity, increased catalytic activity, and/or improved biochemical stability.
- a tyrosine residue at/near the active site of prokaryotic PAL e.g., position 78 in AvPAL
- one or more amino acids at/near the active site of the prokaryotic PAL variant that is not required for enzyme activity is substituted by a lysine residue.
- prokaryotic PAL variants are isolated and purified in accordance with the methods of the present invention and is thereby present in amounts which enable using the prokaryotic PAL enzyme therapeutically.
- a cDNA encoding for a complete or wild-type prokaryotic PAL is used.
- a cDNA encoding for a biologically active fragment, mutant, variant or analog thereof may be used.
- the present invention provides compositions of optimized prokaryotic PAL obtained by structure-based molecular engineering approaches and/or chemically-modified (e.g., pegylated) forms of PAL.
- Specific embodiments contemplate optimal compositions of prokaryotic PAL with improved specific activity, enhanced stability, reduced immunogenicity and/or proteolytic sensitivity appropriate for therapeutic use.
- a preferred embodiment is a pegylated form of Nostoc punctiforme PAL with improved specific activity, enhanced stability, reduced immunogenicity and/or proteolytic sensitivity.
- Another preferred embodiment is a pegylated form of Anabaena variabilis PAL with improved specific activity, enhanced stability, reduced immunogenicity and/or proteolytic sensitivity.
- the biologically active sites of wild-type prokaryotic PAL according to the invention may be modified as desired to optimize PAL kinetic characteristics.
- a modified prokaryotic PAL has sufficient activity to reduce plasma phenylalanine levels in a subject upon treatment to a range from below the level of detection to between about 20 ⁇ M to 60 ⁇ M, preferably to less than about 20 ⁇ M, and even more preferably to less than about 10 ⁇ M, using standard detection methods well known in the art.
- the biologically active modified prokaryotic PAL has a kcat of at least about 0.1 s-1, preferably greater than about 0.5 s-1, and even more preferably greater than about 1.0 s-1.
- the biologically active modified prokaryotic PAL has a kcat of at least about 0.4 s-1, preferably greater than about 2.0 s-1 , and even more preferably greater than about 4.0 s-1. In other preferred embodiments, the biologically active modified prokaryotic PAL has a Km of between about 10 ⁇ M to about 2000 ⁇ M. In more preferred embodiments, the biologically active modified prokaryotic PAL has a Km of between about 10 ⁇ M to about 1000 ⁇ M. In even more preferred embodiments, the biologically active modified prokaryotic PAL has a Km of between about 10 ⁇ M to about 500 ⁇ M.
- the biologically active modified prokaryotic PAL exhibits enzymatic activity from about at least 50% of to about 10-fold greater than the wild-type PAL. In other preferred embodiments, the biologically active modified prokaryotic PAL exhibits enzymatic activity from about at least 50% of to about 100% higher than the wild-type PAL.
- Such biological active modified prokaryotic PAL proteins may be formed using methods well known in the art, such as by site-directed mutagenesis.
- the invention contemplates use of prokaryotic PAL or a biologically active fragment, mutant, variant or analog thereof that metabolizes phenylalanine (i.e., converts phenylalanine to another substance) in preparation of a medicament for preventing or treating cancer in a subject, preferably in a human subject, as well as a pharmaceutical composition containing prokaryotic PAL or a biologically active fragment, mutant, variant or analog thereof for use in preventing or treating cancer in a subject, preferably in a human subject.
- the medicament is for preventing cancer in a human subject.
- the medicament is for treating cancer in a human subject.
- the pharmaceutical composition comprises highly purified PAL derived from bacteria, or biologically active fragment, mutant, variant or analog thereof, and a pharmaceutically acceptable carrier.
- Preferred preparations contain prokaryotic PAL or biologically active fragment, mutant, variant or analog thereof with a purity of greater than 90%, 95%, 96%, 97%, 98%, 99%, 99.2%, 99.5%, 99.6%, 99.7%, 99.8%, or 99.9%.
- the relative specific activity of the prokaryotic PAL, or biologically active fragment, mutant, variant or analog thereof, according to the present invention is preferably at least about 50%, and more preferably greater than about 110%, of the specific activity of wild-type prokaryotic PAL.
- the present invention features novel methods of using prokaryotic PAL variant compositions for therapeutic purposes.
- the invention contemplates methods of treating various forms of cancer.
- the invention contemplates methods for treating cancer by administering to a subject in need of such treatment a therapeutically effective amount of a pharmaceutical composition comprising a prokaryotic PAL variant and a pharmaceutically acceptable carrier, wherein the prokaryotic PAL variant has a greater phenylalanine- converting activity and/or a reduced immunogenicity as compared to a wild-type PAL and is effective in reducing the phenylalanine concentration in the blood, serum or plasma, preferably in the plasma, of the subject to a range from below the level of detection to between about 20 ⁇ M to 60 ⁇ M, preferably to less than about 20 ⁇ M, and even more preferably to less than about 10 ⁇ M.
- one or more amino acid residues of the prokaryotic PAL variant have been substituted by another amino acid residue wherein the substitution increases phenylalanine-converting activity and/or reduces immunogenicity as compared to the wild-type PAL.
- one or more cysteine residues of the prokaryotic PAL variant have been substituted by another amino acid residue.
- one or more cysteine residues of the prokaryotic PAL variant have been substituted by a serine residue.
- the prokaryotic PAL variant is an Anabaena variabilis PAL (AvPAL) variant.
- one or more cysteine residues of the AvPAL variant have been substituted by a serine residue that is selected from the group consisting of cysteine residues at positions 64, 318, 503 and 565, by a serine residue at position 565, or by serine residues at positions 503 and 565.
- the prokaryotic PAL variant comprises a water-soluble polymer.
- the water-soluble polymer is polyethylene glycol.
- the prokaryotic PAL variant is an Anabaena variabilis PAL (AvPAL) variant, and the ratio of the AvPAL variant and the polyethylene glycol is about 1 :3 (1 :3 AvPAL:PEG).
- the prokaryotic PAL variant is an Anabaena variabilis PAL (AvPAL) variant
- AvPAL Anabaena variabilis PAL
- the ratio of the AvPAL variant and the polyethylene glycol is about 1 :3 (1 :3 AvPAL:PEG)
- the cysteine residues at positions 503 and 565 of the AvPAL variant have been substituted by serine residues.
- the invention provides a method for treating cancer comprising administering to a subject in need of such treatment a therapeutically effective amount of a pharmaceutical composition comprising an AvPAL variant and a pharmaceutically ⁇ acceptable carrier, wherein the cysteine residues at positions 503 and 565 of the AvPAL variant have been substituted by serine residues, the AvPAL variant further comprises a water-soluble polymer of polyethylene glycol, wherein the ratio of AvPAL variant and the polyethylene glycol is about 1:3, and the AvPAL variant is effective in reducing the phenylalanine concentration in the blood, serum or plasma, preferably in the plasma, of the subject to a range from below the level of detection to between about 20 ⁇ M to 60 ⁇ M, preferably to less than about 20 ⁇ M, and even more preferably to less than about 10 ⁇ M.
- the cancer is a cancer wherein the proliferation and/or survival of cells derived from the cancer is sensitive to phenylalanine restriction or depletion.
- the cancer is lung cancer, brain or central nervous system cancer, colon cancer, prostate cancer, renal cancer or metastatic melanoma.
- the cancer is head and neck cancer, ovarian cancer, uterine cancer, leukemia (e.g., acute myeloid leukemia or acute lymphoblastoid leukemia) or myeloma.
- the cancer is pediatric cancer or a resistant cancer (i.e., a cancer that has been shown to be resistant to cancer therapeutic agents or targeted cancer therapeutic agents).
- the invention describes methods of treating cancer in a subject comprising administering to the subject a prokaryotic PAL or a biologically active fragment, mutant, variant or analog thereof wherein the administration of prokaryotic PAL is effective to lower the phenylalanine (Phe) concentration in the blood, serum or plasma, preferably in the plasma, of the subject as compared to the concentration in the absence of prokaryotic PAL administration.
- a prokaryotic PAL or a biologically active fragment, mutant, variant or analog thereof wherein the administration of prokaryotic PAL is effective to lower the phenylalanine (Phe) concentration in the blood, serum or plasma, preferably in the plasma, of the subject as compared to the concentration in the absence of prokaryotic PAL administration.
- a subject selected for treatment according to the methods of the invention can have any plasma Phe concentration, e.g., from about 40 ⁇ M to about 2000 ⁇ M, or a normal range of plasma Phe concentration, such a concentration may be in the range from about 40 ⁇ M to about 80 ⁇ M, more typically in the range from about 50 ⁇ M to about 70 ⁇ M, with the range in most human individuals between about 55 ⁇ M to about 65 ⁇ M.
- the plasma Phe concentration of the subject upon treatment is reduced in the range from below the level of detection to between about 20 ⁇ M to 60 ⁇ M, preferably to less than about 20 ⁇ M, and even more preferably to less than about 10 ⁇ M, using standard detection methods well known in the art.
- the invention also contemplates methods of treating cancer by administering to a subject in need of such treatment a therapeutically effective amount of a pharmaceutical composition comprising a prokaryotic PAL variant and a pharmaceutically acceptable carrier, in combination with a protein-restricted (i.e., phenylalanine-free) diet, wherein the treatment is effective to produce a decrease in the plasma Phe concentration of the subject in the absence of the combined administration.
- a protein-restricted i.e., phenylalanine-free
- the plasma Phe concentration of the subject upon treatment is reduced in the range from below the level of detection to between about 20 ⁇ M to 60 ⁇ M, preferably to less than about 20 ⁇ M, and even more preferably to less than about 10 ⁇ M, using standard detection methods well known in the art.
- prokaryotic PAL or a biologically active fragment, mutant, variant or analog thereof may also be administered in combination with a protein-restricted diet.
- the protein-restricted diet administered in the methods herein is one that is a phenylalanine-restricted diet wherein the total Phe intake of the subject is restricted to less than 600 mg per day.
- the protein-restricted diet is a phenylalanine- restricted diet wherein the total Phe is restricted to less than 300 mg per day.
- the protein-restricted diet is one supplemented with one or more amino acids, such as, for example and not for limitation, tyrosine, valine, isoleucine and/or leucine.
- a pharmaceutical composition comprising prokaryotic PAL or a biologically active fragment, mutant, variant or analog thereof and a pharmaceutically acceptable carrier, diluent or excipient.
- the pharmaceutical composition may further comprise a medical protein supplement.
- the protein supplement is phenylalanine-free.
- the protein supplement preferably is fortified with L-tyrosine, L- glutamine, L-carnitine at a concentration of 20 mg/100 g supplement, L-taurine at a concentration of 40 mg/100 g supplement and selenium. It may further comprise the recommended daily doses of minerals, e.g., calcium, phosphorus and magnesium.
- minerals e.g., calcium, phosphorus and magnesium.
- the supplement further may comprise the recommended daily dose of one or more amino acids selected from the group consisting of L-leucine, L-proline, L-lysine acetate, L-valine, L- isoleucine, L-arginine, L-alanine, glycine, L-asparagine monohydrate, L-tryptophan, L- serine, L-threonine, L-histidine, L-methionine, L-glutamic acid, and L-aspartic acid.
- the supplement may be fortified with the recommended daily dosage of vitamins A, D and E.
- the supplement preferably comprises a fat content that provides at least 40% of the energy of the supplement.
- Such a supplement may be provided in the form of a powder supplement or in the form of a protein bar.
- the invention also contemplates methods of treating cancer by administering to a subject in need of such treatment a therapeutically effective amount of a pharmaceutical composition comprising a prokaryotic PAL variant and a pharmaceutically acceptable carrier, in combination with a cancer therapeutic agent or a targeted cancer therapeutic agent, wherein the treatment is effective to produce a decrease in the plasma phenylalanine concentration of the subject in the absence of the combined administration.
- the plasma Phe concentration of the subject upon treatment is reduced in the range from below the level of detection to between about 20 ⁇ M to 60 ⁇ M, preferably to less than about 20 ⁇ M, and even more preferably to less than about 10 ⁇ M, using standard detection methods well known in the art.
- Preferred embodiments include optimizing the dosage to the needs of the organism to be treated, preferably mammals or humans, to effectively prevent or ameliorate the disease symptoms.
- Prokaryotic PAL may be administered in a single daily dose, multiple doses on a daily basis, in a single weekly dose, multiple doses on a weekly basis, in a single monthly dose or multiple doses on a monthly basis.
- the PAL therapy is not continuous, but rather PAL is administered on a daily basis until the plasma Phe concentration of the subject is decreased to a range from below the level of detection to between about 20 ⁇ M to 60 ⁇ M, preferably less than about 20 ⁇ M, and even more preferably less than about 10 ⁇ M, using standard detection methods well known in the art.
- the plasma Phe concentration of the subject is monitored on a daily basis and the PAL is administered when a 10%-20% increase in plasma Phe concentration is observed.
- doses are delivered once weekly.
- the invention contemplates doses of at least 0.001 mg/kg, 0.005 mg/kg, 0.01 mg/kg, 0.05 mg/kg, and may range up to 0.1 mg/kg, 0.5 mg/kg, 1.0 mg/kg, 5.0 mg/kg, 12 mg/kg or higher per week.
- a preferred dose is 1 mg/kg/week, a more preferred dose is 0.1 mg/kg/week, and even more preferred dose is 0.01 mg/kg/week.
- parenteral or nonparenteral routes of administration including oral, transdermal, transmucosal, intrapulmonary (including aerosolized), intramuscular, subcutaneous, or intravenous, which deliver equivalent dosages are contemplated.
- Administration by bolus injection or infusion directly into the joints or CSF is also specifically contemplated, such as intrathecal, intracerebral, intraventricular, via lumbar puncture, or via the cisterna magna.
- the doses are delivered subcutaneously or orally.
- prokaryotic PAL activity in the human subjects are also contemplated, including gene therapy. Transfer of a prokaryotic PAL gene is possible through a variety of means known in the art, including viral vectors, homologous recombination, or direct DNA injection. Within the scope of this aspect are embodiments featuring nucleic acid sequences encoding all or a part of prokaryotic PAL or a biologically active fragment, mutant, variant or analog thereof, which may be administered in vivo into cells that are, for example and not for limitation, affected with the cancer, located nearby or adjacent to the cancer, hematopoietic cells that circulate in the bloodstream and/or migrate to the site of the cancer.
- the present invention provides pharmaceutical compositions or formulations of prokaryotic PAL variants, comprising bacterial PAL and biologically active fragments, mutants, variants or analogs thereof, and a pharmaceutically acceptable carrier, wherein the pharmaceutically acceptable carrier comprises a stabilizer.
- the stabilizer is L-phenylalanine or structural analog thereof.
- the stabilizer is selected from the group consisting of L-phenylalanine, trans- cinnamic acid and benzoic acid.
- the stabilizer is L-phenylalanine.
- the stabilizer is trans-cinnamic acid.
- the stabilizer is benzoic acid.
- the invention provides methods of treating cancer using such pharmaceutical compositions or formulations.
- the pharmaceutical composition or formulation comprises a prokaryotic PAL variant and a pharmaceutically acceptable carrier, wherein the prokaryotic PAL variant is an AvPAL variant, the ratio of the AvPAL variant and polyethylene glycol is about 1 :3 (1 :3 AvPAL:PEG), and the cysteine residues at positions 503 and 565 of the AvPAL variant have been substituted by serine residues, and the pharmaceutically acceptable carrier comprises a stabilizer.
- the stabilizer is L-phenylalanine or structural analog thereof.
- the stabilizer is selected from the group consisting of L-phenylalanine, trans-cinnamic acid and benzoic acid.
- the stabilizer is L-phenylalanine.
- the stabilizer is trans-cinnamic acid.
- the invention provides methods of treating cancer using such pharmaceutical compositions or formulations.
- the present invention features a method to produce recombinant prokaryotic PAL or a biologically active fragment, mutant, variant or analog thereof in amounts which enable using the enzyme therapeutically.
- the present invention contemplates PAL derived from bacteria including, but not limited to, Streptomyces, Sorangium, Pseudomonas, and cyanobacteria such as Nostoc and Anabaena.
- PAL is derived from the bacterial species Streptomyces maritimus, S. verticillatus, Soragium cellulosum, Nostoc punctiforme, Nostoc tobacum, Anabaena variabilis, or Pseudomonas putida.
- PAL is derived from cyanobacteria species Nostoc punctiforme or Anabaena variabilis. In a particularly preferred embodiment, PAL is derived from Anabaena variabilis. In another embodiment, prokaryotic PAL enzyme activity is generated using cDNA or DNA sequences that are derived from sequences sometimes described as coding for HAL activity or featuring a PAL-HAL motif, but possessing key PAL residues that differ from HAL.
- the method comprises the step of transforming a cDNA or DNA encoding for all or a part of a prokaryotic PAL or a biologically active fragment, mutant, variant or analog thereof into a cell suitable for the expression thereof.
- an expression vector is used to transfer the DNA into a suitable cell or cell line for expression thereof.
- the cDNA or DNA is transformed into E. coli and recombinant bacterial PAL is overexpressed, optionally as a fusion protein.
- the method of producing prokaryotic PAL comprises the steps of: (a) growing cells transformed with a cDNA or DNA encoding all or a biologically active fragment, mutant, variant or analog thereof of prokaryotic PAL in a suitable growth medium to an appropriate density to produce a seed culture, (b) introducing the transformed cells into a bioreactor, (c) supplying a suitable growth medium to the bioreactor, and (d) separating the transfected cells from the media containing the enzyme.
- recombinant prokaryotic PAL or a biologically active fragment, mutant, variant or analog thereof is over-expressed, with or without an N-terminal tag (e.g., octahistidyl-tag), in a vector, preferably pIBXl (Su, et al, Appl. Environ. Microbiol. 62:2723-2734 (1996)) or pET28a (Invitrogen) with an inducible promoter such as with IPTG (isopropyl-beta-D-thiogalactopyranoside), in E. coli BLR(DE3)/pLysS (Novagen) or E.
- N-terminal tag e.g., octahistidyl-tag
- a vector preferably pIBXl (Su, et al, Appl. Environ. Microbiol. 62:2723-2734 (1996)) or pET28a (Invitrog
- the method of producing prokaryotic PAL comprises the steps of: (1) growing a seed culture for a bioreactor/fermenter from a glycerol stock in shake flasks; (2) introducing such seed culture into a controlled bioreactor in fed-batch mode; (3) growing said culture in glucose- supplemented media, pH (7.8), > 20% dissolved oxygen, agitation up to 1200 rpm, 30°C until reaching a cell density of OD600 of 70-100 (-22-25 hrs); (4) inducing said culture with 0.4 mM IPTG; (5) growing said culture at a reduced temperature of 22 to 26°C until activity change is ⁇ 0.1 ILVmL (approximately 40-48 hrs and an OD600 typically of 200); and (5) harvesting bacteria by continuous centrifugation.
- the cell culture media is typically defined and composed of yeast extract protein, peptone-try
- the present invention features a method to purify prokaryotic PAL or a biologically active fragment, mutant, variant or analog thereof.
- a transformed cell mass is grown and ruptured leaving crude recombinant enzyme. Exogenous materials are normally separated from the crude bulk to prevent fouling of the columns. Chromatographic purification is conducted using one or several chromatographic resins. Subsequently, the purified protein is formulated into a buffer designed to provide stable activity over an extended period of time.
- the method to purify the prokaryotic PAL comprises the steps of: (a) lysis of the bacteria containing recombinant PAL; (b) treatment of lysate with heat to inactivate viruses;
- the present invention contemplates screening assays for identifying prokaryotic PAL or a biologically active fragment, mutant, variant or analog thereof that can prevent, ameliorate, or treat cancer by contacting a tumor cell in culture with the prokaryotic PAL and determining whether the prokaryotic PAL reduces the proliferation and/or survival of the tumor cells.
- screening assays may also include the steps of creating variants that include conservative or non-conservative substitutions in the active sites, e.g.
- Glyl42, Thr-Ser-Gly triad (143-145), Aspl46, Leul47, Asnl96, Ilel95, Leul92, Leu76, Asn79, Met400, Thr428, Gln432 in EncP from Streptomyces maritimus, or their equivalents in other prokaryotic PAL, such as Nostoc punctiforme or Anabaena variabilis, which are equivalent to residues Ser210, Ala-Ser-Gly triad (211-213), Asp214, Leu215, Asn270, Val269, Leu266, Leul34, Hisl37, Lys468, Glu496, Gln500 in PAL from Rhodosporidium toruloides (RtPAL), in regions adjacent to the active sites, or throughout the polypeptide sequence, followed by testing the variants for in vitro phenylalanine converting activity.
- Rhodosporidium toruloides Rhodosporidium torul
- the method is a high throughput assay.
- complete genomes of the bacterial species are sequenced and screened for the presence of prokaryotic PAL homologs using a bioinformatics approach.
- PAL catalytic activity of the protein product of such homologs is confirmed, such as by testing ability to convert phenylalanine to trans-cinnamate in vitro.
- the invention provides methods of using prokaryotic PAL compositions for the diagnosis of diseases, including but not limited to cancer.
- prokaryotic PAL is used to measure levels of Phe in blood, plasma or serum samples.
- the invention contemplates a diagnostic kit comprising prokaryotic PAL for use in monitoring blood, plasma or serum samples of subjects for levels of Phe.
- FIGURE 1 Gene sequence of Nostoc punctiforme PAL (SEQ ID NO:1);
- FIGURE IB Protein sequence of Nostoc punctiforme PAL (SEQ ID NO:2).
- FIGURE 2A Gene sequence of Anabaena variabilis PAL (SEQ ID NO:3)
- FIGURE 2B Protein sequence of Anabaena variabilis PAL (SEQ ID NO:4).
- FIGURE 3 Relatedness tree of aromatic amino acid ammonia-lyases from prokaryotes and eukaryotes. Sequences were retrieved from GenBank (accession numbers are given in parentheses) and aligned with ClustalX (1.83) using the Neighbor Joining Method.
- FIGURE 4 Alignment of cyanobacterial protein sequences of N. punctiforme PAL (SEQ ID NO:2) and A. variabilis PAL (SEQ ID NO:4) with EncP PAL (SEQ ID. No. 5) and P. putida HAL (SEQ ID NO:6). Active site residues, which correspond to PAL or HAL activity, are highlighted.
- FIGURE 5 A Protein sequence of Anabaena variabilis phenylalanine ammonia-lyase (PAL) with a cysteine to serine substitution at position 64 (AvPAL_C64S, SEQ ID NO:7);
- FIGURE 5B Protein sequence of Anabaena variabilis PAL with a cysteine to serine substitution at position 318 (AvPAL_C318S, SEQ ID NO:8);
- FIGURE 5C Protein sequence of Anabaena variabilis PAL with a cysteine to serine substitution at position 503 (AvPAL_C503S, SEQ ID NO:9);
- FIGURE 5D Protein sequence of Anabaena variabilis PAL with a cysteine to serine substitution at position 565 (AvPAL_C565S, SEQ ID NO: 10);
- FIGURE 5E Protein sequence of Anabaena variabilis PAL with cysteine to serine substitutions at positions 503 and 565 (AvPAL_C565SC50
- FIGURE 6A Effect of cysteine to serine substitutions at position 565 or both positions 565 and 503 of unpegylated AvPAL on in vitro PAL specific enzyme activity after incubation for various lengths of time at 37°C.
- FIGURE 6B Effect of cysteine to serine substitutions at position 565 or both positions 565 and 503 of pegylated AvPAL on in vitro PAL specific enzyme activity after incubation for various lengths of time at 37°C.
- FIGURE 7A Effect of cysteine to serine substitutions in AvPAL on formation of protein aggregates in solution as analyzed by gel electrophoresis under denaturing conditions (left panel) or native conditions (right panel).
- FIGURE 7B Effect of cysteine to serine substitutions in AvPAL on formation of protein aggregates in solution as analyzed by SEC-HPLC.
- FIGURE 8 Effect of cysteine to serine substitutions at positions 565 and 503 (dbl Mutant) in AvPAL on site-specific pegylation at various PEG concentrations.
- FIGURE 9 Effect of treatment of AvPAL with 0.05% Tween80 or 10 mM EDTA on formation of protein aggregates in solution as analyzed by SEC-HPLC.
- FIGURE 10 Effect of treatment of AvPAL by dithiotreitol (DTT) on formation of protein aggregates in solution as analyzed by SEC-HPLC.
- FIGURE 1OB Effect of treatment of AvPAL by DTT and N-ethylmaleimide (NEM) on formation of protein aggregates in solution as analyzed by SEC-HPLC.
- DTT dithiotreitol
- NEM N-ethylmaleimide
- FIGURE 11 Effect of phenylalanine (Phe) and trans-cinnamic acid (t-CA) as indicated on the enzyme activity of a pegylated AvPAL with cysteine to serine substitutions at positions 565 and 503 (AvPAL_C565SC503S) (rAV-P AL-PEG) stored for various times (days) at 4°C (top panel), at 25°C (middle panel) and at 37°C (bottom panel).
- Phe phenylalanine
- t-CA trans-cinnamic acid
- FIGURE 12 Effect of tyrosine (Tyr) at 1 and 5 mM as indicated on the enzyme activity of a pegylated AvPAL with cysteine to serine substitutions at positions 565 and 503 (AvPAL_C565SC503S) (rAV-P AL-PEG) stored for various times (days) at 4 0 C (top panel), at 25°C (middle panel) and at 37°C (bottom panel).
- FIGURE 13 A Effect of phenylalanine (Phe), benzoic acid and pyridoxamine, alone or in combination as indicated, on the enzyme activity of a pegylated AvPAL with cysteine to serine substitutions at positions 565 and 503 (AVPAL-CSOSSCSOSS) (rAV-P AL-PEG) stored for various times (weeks) at 4°C (top panel) and at 37°C (bottom panel).
- FIGURE 13B The chemical structures of benzoic acid (left), phenylalanine (middle) and trans-cinnamic acid (right) are depicted.
- FIGURE 14A Effect of a single subcutaneous injection of a pegylated AvPAL with cysteine to serine substitutions at positions 565 and 503 (AvPAL_C565SC503S) at 4 mg/kg (diamonds) and at 12 mg/kg (squares) into Cynomolgus monkeys on the plasma AvPAL_C565SC503S levels over time (hours).
- FIGURE 14B Effect of a single subcutaneous injection of AvPAL_C565SC503S at 4 mg/kg into Cynomolgus monkeys on the plasma AvPAL_C565SC503S (diamonds) and phenylalanine (squares) levels over time (hours).
- FIGURE 15 A Effect of a single intravenous injection of a pegylated AvPAL with cysteine to serine substitutions at positions 565 and 503 (AvPAL_C565SC503S) at 1 mg/kg (diamonds), at 5 mg/kg (squares) and at 25 mg/kg (triangles) into rats on the plasma AvPAL_C565SC503S levels over time (hours).
- FIGURE 15A Effect of a single subcutaneous injection of AvPAL_C565SC503S at 10 mg/kg (diamonds), at 25 mg/kg (squares) and at 250 mg/kg (triangles) into rats on the plasma AvPAL_C565SC503S levels over time (hours)
- FIGURE 16A Effect of a pegylated AvPAL with cysteine to serine substitutions at positions 565 and 503 (AvPAL_C565SC503S) at 0.01, 0.1, 1, 10 and 100 ⁇ g/mL as indicated on proliferation (as measured by propidium iodide staining) of NOMOl acute myeloid leukemia (AML) cells in vitro.
- FIGURE 16B Effect of AvPAL_C565SC503S at 0.1, 1, 10 and 100 ⁇ g/mL as indicated on proliferation of IM9 myeloma cells in vitro.
- FIGURE 17 A Effect of a pegylated AvPAL with cysteine to serine substitutions at positions 565 and 503 (AvPAL_C565SC503S) at 0.01, 0.1, 1, 10 and 100 ⁇ g/mL as indicated on proliferation (as measured by propidium iodide staining) of SF268 (top) and 498L (bottom) brain/CNS tumor cells in vitro.
- FIGURE 17B Effect of AvPAL_C565SC503S at 0.01, 0.1, 1, 10 and 100 ⁇ g/mL as indicated on proliferation of HT29 (top) and HCTl 16 (bottom) colon tumor cells in vitro.
- FIGURE 17C Effect of AvPAL_C565SC503S at 0.01, 0.1, 1, 10 and 100 ⁇ g/mL as indicated on proliferation of H460 (top), 529L (middle) and 629L (bottom) lung tumor cells in vitro.
- FIGURE 17D Effect of AvPAL_C565SC503S at 0.01, 0.1, 1, 10 and 100 ⁇ g/mL as indicated on proliferation of LNCAP (top), PC3M (middle) and DU 145 (bottom) prostate tumor cells in vitro.
- FIGURE 18 Effect of pegylated AvPAL with cysteine to serine substitutions at positions 565 and 503 (AvPAL_C565SC503S) on tumor size in a B16 melanoma tumor cell line xenograft model. Enzyme was administered prophylactically (top) or therapeutically (bottom) by subcutaneous injection at 40, 80 or 100 mg/kg as indicated.
- FIGURE 19 Effect of pegylated AvPAL with cysteine to serine substitutions at positions 565 and 503 (AvPAL_C565SC503S) on tumor size in SNU398 (top) and HepG2 (bottom) hepatoma tumor cell line xenograft models. Enzyme was administered prophylactically by subcutaneous injection at 60 mg/kg as indicated.
- PAL/HAL from Streptomyces maritimus (also known as EncP, SEQ ID NO: 5, FIGURE 4), PAL/HAL from Nostoc punctiforme (Accession ZPJ)0105927 from Nostoc punctiforme ATCC 29133, submitted October 1, 2004, NCBI Microbial Genomes Annotation Project) (SEQ ID NO:2, FIGURE 4), PAL/HAL from Anabaena variabilis (Gene ID 3679622, Ava_3988 phenylalanine/histidine ammonia-lyase, Anabaena variabilis ATCC 29413, March 31, 2006) (SEQ ID NO:4, FIGURE 4), the photosynthetic prokaryote Anacystis nidulans (Lofflehardt, Z.
- Cyanobacteria such as Anabaena and Nostoc have been studied with respect to their production of bioactive natural products that are generated via mixed polyketide-peptide biosynthetic pathways (Moore, Nat. Prod. Rep. 22(5):580-593 (2005); Becker, et al., Gene 325:35-42 (2004); Hoffman, et al., Gene 311:171-180 (2003)).
- PAL is a ubiquitous higher plant enzyme that catalyzes the nonoxidative deamination of phenylalanine to cinnamic acid in the committed step to phenylpropanoid metabolites (Hahlbrock, et al., Annu. Rev. Plant Phys. Plant MoI. Biol. 40:347-369 (1989)), PAL has only been encountered in a few bacteria where it is involved in benzoyl-CoA biosynthesis in "S. maritimus” (Xiang, et ai, J. Biol. Chem. 277:32505-32509 (2002)) and Sorangium cellulosum (Hill, et al, Chem. Commun.
- enterocin is a natural product of the marine bacterium "Streptomyces maritimus" whose biosynthesis involves a number of unusual features (Hertweck, et al, Chem. Biol. 11 :461-468 (2004); Piel, et al, Chem. Biol. 7:943-955 (2000); Piel, et al, J. Am. Chem. Soc. 122:5415-5416 (2000); Xiang, et al, Proc. Natl.
- PKS rare polyketide synthase
- CoA benzoyl-coenzyme A
- PAL novel bacterial phenylalanine ammonia- lyase
- the first prokaryotic PAL-encoding gene (encP) (SEQ ID NO: 5) was characterized and its role in de novo cinnamic acid and enterocin synthesis in "S. maritimus" was identified (Kalaitzis, et al, J. Am. Chem. Soc. 125:9290-9291 (2003); Xiang, et al, J. Biol. Chem. 277:32505-32509 (2002)).
- the encP gene encodes a 522 amino acid protein that is considerably smaller than eukaryotic PALs by nearly 200 amino acid residues.
- sequence homologous to plant PALs such as from Petroselinum crispum (R ⁇ ther, et al , Eur. J. Biochem. 269:3065-3075 (2002)) (CAA57056, 30% identical and 48% similar)
- HALs bacterial histidine ammonia-lyases
- Pseudomonas putida (Schwede, et al, Biochemistry 27:5355-5361 (1999)) (A35251, 36% identical and 54% similar, SEQ ID NO: 6, FIGURE 4)
- TAL tyrosine ammonia-lyase
- the homology includes the conserved active site serine residue at position 143 of the phenylalanine/histidine/tyrosine family of ammonia-lyases that is the probable precursor of the modified dehydroalanine residue in the 4-methylideneimidazole-5-one (MIO) prosthetic group (Langer, et al, Adv. Prot. Chem. 58:175-188 (2001); Poppe, Curr. Opin. Chem. Biol. 5:512-524 (2001); Schwede, et al, Biochemistry 27:5355-5361 (1999)).
- MIO 4-methylideneimidazole-5-one
- EncP shares greatest sequence homology to AdmH (AAO39102, 63% identical and 76% similar), a putative phenylalanine aminomutase involved in andrimid biosynthesis in Pantoea agglomerans that is related to the tyrosine aminomutase Sgc4 from Streptomyces globisporus (Christenson, et al, J. Am. Chem. Soc. 125:6062-6063 (2003); Christenson, et al, Biochemistry 42:12708-12718 (2003)).
- HAL and PAL were shown to share in common a mechanism for the chemically difficult elimination of ammonia from histidine and phenylalanine, respectively.
- a superelectrophilic prosthetic group 5 methylene-3,5-dihydroimidazol-4-one (MIO) activates the non-acidic beta hydrogen atoms of their respective substrates by a Friedel-Crafts-type attack at the aromatic ring.
- the sigma complex that is generated prevents the extraction of protons from the ring by excluding any bases from access to the binding pocket of the enzyme.
- the formation of an exocyclic double bond is key in the elimination of ammonia, rearomatization, and fragmentation.
- the prosthetic MIO group is regenerated and the product urocanate or cinnamate is formed (Poppe, et al, Angew. Chem. Int. Ed. 44:3668-3688 (2005)).
- HAL/PAL conserved region Because of the high homology between HAL and PAL, the conserved regions of HAL and PAL are referred to as the HAL/PAL conserved region. This high homology can create some ambiguities in databases like NCBI on the potential enzyme activity of a "PAL- HAL" protein conducting to mislabeling, such as with protein sequences listed in the NCBI database for Nostoc punctiforme and Anabaena variabilis. Therefore some PAL enzymes can be mislabeled HAL enzymes. Although the active sites of PALs and HALs are very similar, they are predicted to differ in some key residues (Calabrese, et al.
- the present invention relates to compositions of such prokaryotic PAL and biologically active fragments, mutants, variants or analogs thereof and their use for therapeutic purposes, including the treatment of cancer.
- Glutamic acid GIu (E)
- Glycine GIy (G)
- Threonine Thr (T) Tryptophan: Trp (W)
- Polynucleotide refers to a polymer composed of nucleotide units.
- Polynucleotides include naturally occurring nucleic acids, such as deoxyribonucleic acid ("DNA”) and ribonucleic acid (“RNA”) as well as nucleic acid analogs.
- Nucleic acid analogs include those which include non-naturally occurring bases, nucleotides that engage in linkages with other nucleotides other than the naturally occurring phosphodiester bond or which include bases attached through linkages other than phosphodiester bonds.
- nucleotide analogs include, for example and without limitation, phosphorothioates, phosphorodithioates, phosphorotriesters, phosphoramidates, boranophosphates, methylphosphonates, chiral-methyl phosphonates, 2-O-methyl ribonucleotides, peptide- nucleic acids (PNAs), and the like.
- PNAs peptide- nucleic acids
- Such polynucleotides can be synthesized, for example, using an automated DNA synthesizer.
- the term “nucleic acid” typically refers to large polynucleotides.
- oligonucleotide typically refers to short polynucleotides, generally no greater than about 50 nucleotides.
- nucleotide sequence is represented by a DNA sequence (i.e., A, T, G, C)
- this also includes an RNA sequence (i.e., A, U, G, C) in which "U" replaces "T.”
- cDNA refers to a DNA that is complementary or identical to an mRNA, in either single stranded or double stranded form.
- the DNA strand having the same sequence as an mRNA is referred to as the "coding strand”; sequences on the DNA strand having the same sequence as an mRNA transcribed from that DNA and which are located 5' to the 5'-end of the RNA transcript are referred to as "upstream sequences"; sequences on the DNA strand having the same sequence as the RNA and which are 3' to the 3' end of the coding RNA transcript are referred to as "downstream sequences.”
- “Complementary” refers to the topological compatibility or matching together of interacting surfaces of two polynucleotides.
- the two molecules can be described as complementary, and furthermore, the contact surface characteristics are complementary to each other.
- a first polynucleotide is complementary to a second polynucleotide if the nucleotide sequence of the first polynucleotide is identical to the nucleotide sequence of the polynucleotide-binding partner of the second polynucleotide.
- the polynucleotide whose sequence 5'-TATAC-3' is complementary to a polynucleotide whose sequence is 5'- GTATA-3 1 .
- a nucleotide sequence is "substantially complementary" to a reference nucleotide sequence if the sequence complementary to the subject nucleotide sequence is substantially identical to the reference nucleotide sequence.
- Encoding refers to the inherent property of specific sequences of nucleotides in a polynucleotide, such as a gene, a cDNA, or an mRNA, to serve as templates for synthesis of other polymers and macromolecules in biological processes having either a defined sequence of nucleotides (i.e., rRNA, tRNA and mRNA) or a defined sequence of amino acids and the biological properties resulting therefrom.
- a gene encodes a protein if transcription and translation of mRNA produced by that gene produces the protein in a cell or other biological system.
- coding strand the nucleotide sequence of which is identical to the mRNA sequence and is usually provided in sequence listings
- non-coding strand used as the template for transcription
- a "nucleotide sequence encoding an amino acid sequence" includes all nucleotide sequences that are degenerate versions of each other and that encode the same amino acid sequence. Nucleotide sequences that encode proteins and RNA may include introns.
- Recombinant polynucleotide refers to a polynucleotide having sequences that are not naturally joined together.
- An amplified or assembled recombinant polynucleotide may be included in a suitable vector, and the vector can be used to transform a suitable host cell.
- a host cell that comprises the recombinant polynucleotide is referred to as a "recombinant host cell.”
- the gene is then expressed in the recombinant host cell to produce, e.g., a "recombinant polypeptide.”
- a recombinant polynucleotide may serve a non-coding function (e.g., promoter, origin of replication, ribosome-binding site, etc.) as well.
- “Expression control sequence” refers to a nucleotide sequence in a polynucleotide that regulates the expression (transcription and/or translation) of a nucleotide sequence operatively linked thereto. "Operatively linked” refers to a functional relationship between two parts in which the activity of one part (e.g., the ability to regulate transcription) results in an action on the other part (e.g., transcription of the sequence).
- Expression control sequences can include, for example and without limitation, sequences of promoters (e.g., inducible or constitutive), enhancers, transcription terminators, a start codon (i.e., ATG), splicing signals for introns, and stop codons.
- Expression vector refers to a vector comprising a recombinant polynucleotide comprising expression control sequences operatively linked to a nucleotide sequence to be expressed.
- An expression vector comprises sufficient cis-acting elements for expression; other elements for expression can be supplied by the host cell or in vitro expression system.
- Expression vectors include all those known in the art, such as cosmids, plasmids (e.g., naked or contained in liposomes) and viruses that incorporate the recombinant polynucleotide.
- Amplification refers to any means by which a polynucleotide sequence is copied and thus expanded into a larger number of polynucleotide molecules, e.g., by reverse transcription, polymerase chain reaction, and ligase chain reaction.
- Primer refers to a polynucleotide that is capable of specifically hybridizing to a designated polynucleotide template and providing a point of initiation for synthesis of a complementary polynucleotide. Such synthesis occurs when the polynucleotide primer is placed under conditions in which synthesis is induced, i.e., in the presence of nucleotides, a complementary polynucleotide template, and an agent for polymerization such as DNA polymerase.
- a primer is typically single-stranded, but may be double-stranded. Primers are typically deoxyribonucleic acids, but a wide variety of synthetic and naturally occurring primers are useful for many applications.
- a primer is complementary to the template to which it is designed to hybridize to serve as a site for the initiation of synthesis, but need not reflect the exact sequence of the template. In such a case, specific hybridization of the primer to the template depends on the stringency of the hybridization conditions. Primers can be labeled with, e.g., chromogenic, radioactive, or fluorescent moieties and used as detectable moieties.
- Polypeptide refers to a polymer composed of amino acid residues, related naturally occurring structural variants, and synthetic non-naturally occurring analogs thereof linked via peptide bonds, related naturally occurring structural variants, and synthetic non- naturally occurring analogs thereof. Synthetic polypeptides can be synthesized, for example, using an automated polypeptide synthesizer.
- the term "protein” typically refers to large polypeptides.
- the term “peptide” typically refers to short polypeptides.
- Conventional notation is used herein to portray polypeptide sequences: the left- hand end of a polypeptide sequence is the amino-terminus; the right-hand end of a polypeptide sequence is the carboxyl-terminus.
- Constant substitution refers to the substitution in a polypeptide of an amino acid with a functionally similar amino acid.
- the following six groups each contain amino acids that are conservative substitutions for one another:
- Amino acids may also be grouped as follows:
- nucleotide or percent “identity,” in the context of two or more polynucleotide or polypeptide sequences, refer to two or more sequences or subsequences that are the same or have a specified percentage of nucleotides or amino acid residues that are the same, when compared and aligned for maximum correspondence, as measured using a sequence comparison algorithm described in prior co-pending United States Patent Application Number 11/230,374 filed on September 19, 2005, which is herein incorporated by reference in its entirety, or by visual inspection.
- substantially homologous or “substantially identical” in the context of two nucleic acids or polypeptides, generally refers to two or more sequences or subsequences that have at least 40%, 60%, 80%, 90%, 95%, 98% nucleotide or amino acid residue identity, when compared and aligned for maximum correspondence, as measured using one of the following sequence comparison algorithms or by visual inspection.
- the substantial identity exists over a region of the sequences that is at least about 50 residues in length, more preferably over a region of at least about 100 residues, and most preferably the sequences are substantially identical over at least about 150 residues.
- the sequences are substantially identical over the entire length of either or both comparison biopolymers.
- substantially pure or “isolated” means an object species is the predominant species present (i.e., on a molar basis, more abundant than any other individual macromolecular species in the composition), and a substantially purified fraction is a composition wherein the object species comprises at least about 50% (on a molar basis) of all macromolecular species present.
- a substantially pure composition means that about 80% to 90% or more of the macromolecular species present in the composition is the purified species of interest.
- the object species is purified to essential homogeneity (contaminant species cannot be detected in the composition by conventional detection methods) if the composition consists essentially of a single macromolecular species.
- the prokaryotic PAL variant compositions of the invention are substantially pure or isolated. In some embodiments, the prokaryotic PAL variant compositions of the invention are substantially pure or isolated with respect to the macromolecular starting materials used in their synthesis. In some embodiments, the pharmaceutical compositions of the invention comprise a substantially purified or isolated prokaryotic PAL variant admixed with one or more pharmaceutically acceptable excipient.
- Naturally occurring refers to the fact that the object can be found in nature.
- a polypeptide or polynucleotide sequence that is present in an organism (including viruses) that can be isolated from a source in nature and which has not been intentionally modified by man in the laboratory is naturally occurring.
- Wild-type is a term referring to the natural genetic form of an organism. A wild-type is distinguished from a mutant form (an organism with a genetic mutation).
- polypeptide and protein refer to a polymer of amino acid residues and are not limited to a minimum length of the product. Thus, peptides, oligopeptides, dimers, multimers, and the like, are included within the definition. Both full-length proteins and fragments thereof are encompassed by the definition.
- the terms also include postexpression modifications of the polypeptide, for example, glycosylation, acetylation, phosphorylation and the like.
- a "polypeptide” refers to a protein, which includes modifications, such as deletions, additions and substitutions (generally conservative in nature), to the native sequence, so long as the protein maintains the desired activity. Such polypeptides may be referred to as "mutants" herein. These modifications may be deliberate, as through site-directed mutagenesis, or may be accidental, such as through mutations arising with hosts that produce the proteins or errors due to PCR amplification.
- variant is a compound, e.g., a peptide, having more than about 70% sequence but less than 100% sequence similarity with a given compound, e.g., a. peptide.
- variants, analogs or derivatives may be comprised of non- naturally occurring amino acid residues, including by way of example and not limitation, homoarginine, ornithine, penicillamine, and norvaline, as well as naturally occurring amino acid residues.
- variants, analogs or derivatives may also be composed of one or a plurality of D-amino acid residues, and may contain non-peptide interlinkages between two or more amino acid residues.
- the "ratio" of a PAL polypeptide (e.g. , AvPAL) and a water-soluble polymer (e.g., polyethylene glycol or PEG) refers to the reaction condition molar ratio between the PAL polypeptide and the water-soluble polymer.
- a ratio of about 1 :3 for AvPAL and polyethylene glycol (1 :3 AvPAL:PEG) means that the chemically modified PAL was produced in a reaction condition with about 1 mol AvPAL per 3 mol of polyethylene glycol.
- a ratio of about 1 :3 AvPALiPEG results in about 10-12 mol PEG per mol AvPAL monomer.
- Treatment or “treating” as used herein refers to prophylactic treatment or therapeutic treatment or diagnostic treatment.
- a "prophylactic" treatment is a treatment administered to a subject who does not exhibit signs of disease or pathology, i.e., a cancer, or exhibits only early signs for the purpose of decreasing the risk of developing pathology.
- the prokaryotic PAL compositions of the invention may be given as a prophylactic treatment to reduce the likelihood of developing pathology, i.e., a cancer, or to minimize the severity of the pathology, if developed.
- a "therapeutic" treatment is a treatment administered to a subject who exhibits signs or symptoms of pathology, i.e., a cancer, for the purpose of diminishing or eliminating those signs or symptoms.
- the signs or symptoms may be biochemical, cellular, histological, functional, subjective or objective.
- the prokaryotic PAL compositions of the invention may be given as a therapeutic treatment or for diagnosis.
- Diagnostic means identifying the presence or nature of a pathologic condition, /. e. , a cancer. Diagnostic methods differ in their specificity and selectivity. While a particular diagnostic method may not provide a definitive diagnosis of a condition, it suffices if the method provides a positive indication that aids in diagnosis.
- composition refers to a composition suitable for pharmaceutical use in subject animal, including humans and mammals.
- a pharmaceutical composition comprises a pharmacologically effective amount of a prokaryotic PAL polypeptide and also comprises a pharmaceutically acceptable carrier.
- a pharmaceutical composition encompasses a composition comprising the active ingredient(s), and the inert ingredient(s) that make up the carrier, as well as any product which results, directly or indirectly, from combination, complexation or aggregation of any two or more of the ingredients, or from dissociation of one or more of the ingredients, or from other types of reactions or interactions of one or more of the ingredients.
- the pharmaceutical compositions of the present invention encompass any composition made by admixing a prokaryotic PAL polypeptide of the present invention and a pharmaceutically acceptable carrier.
- “Pharmaceutically acceptable carrier” refers to any of the standard pharmaceutical excipients, vehicles, diluents, stabilizers, preservatives, solubilizers, emulsifiers, adjuvants and/or carriers, such as, for example and not for limitation, a phosphate buffered saline solution, 5% aqueous solution of dextrose, and emulsions, such as an oil/water or water/oil emulsion, and various types of wetting agents and/or adjuvants. Suitable pharmaceutical carriers and formulations are described in Remington's Pharmaceutical Sciences, 19th Ed. (Mack Publishing Co., Easton, 1995). Preferred pharmaceutical carriers depend upon the intended mode of administration of the active agent.
- Typical modes of administration include enteral (e.g., oral) or parenteral (e.g., subcutaneous, intramuscular, intravenous or intraperitoneal injection; or topical, transdermal, or transmucosal administration).
- a “pharmaceutically acceptable salt” is a salt that can be formulated into a prokaryotic PAL variant composition for pharmaceutical use including, e.g., metal salts (sodium, potassium, magnesium, calcium, etc.) and salts of ammonia or organic amines.
- pharmaceutically acceptable or “pharmacologically acceptable” is meant a material which is not biologically or otherwise undesirable, /. e. , the material may be administered to an individual without causing any undesirable biological effects or interacting in a deleterious manner with any of the components of the composition in which it is contained.
- unit dosage form refers to physically discrete units suitable as unitary dosages for human and animal subjects, each unit containing a predetermined quantity of prokaryotic PAL variant of the present invention calculated in an amount sufficient to produce the desired effect in association with a pharmaceutically acceptable diluent, carrier or vehicle.
- the specifications for the novel unit dosage forms of the present invention depend on the particular prokaryotic PAL variant employed and the effect to be achieved, and the pharmacodynamics associated with each prokaryotic PAL variant in the host.
- physiological pH or a “pH in the physiological range” is meant a pH in the range of approximately 7.2 to 8.0 inclusive, more typically in the range of approximately 7.2 to 7.6 inclusive.
- the term "subject” encompasses mammals and non-mammals.
- mammals include, but are not limited to, any member of the mammalian class: humans, non-human primates such as chimpanzees, and other apes and monkey species; farm animals such as cattle, horses, sheep, goats, swine; domestic animals such as rabbits, dogs, and cats; laboratory animals including rodents, such as rats, mice and guinea pigs, and the like.
- non-mammals include, but are not limited to, birds, fish, and the like. The term does not denote a particular age or gender.
- a high-resolution three-dimensional protein crystal structure of a prokaryotic PAL may be used in methods involving protein engineering to improve the biochemical and biophysical properties of a prokaryotic PAL, and to increase the in vivo therapeutic effectiveness of a prokaryotic PAL.
- the invention contemplates prokaryotic PAL variants with greater phenylalanine-converting activity and/or reduced immunogenicity as compared to a wild-type prokaryotic PAL.
- the invention also contemplates prokaryotic PAL variants with greater biochemical stability and/or biochemical half-life as compared to a wild-type prokaryotic PAL.
- the biologically active sites of a wild-type prokaryotic PAL according to the invention may be modified as desired to optimize PAL kinetic characteristics.
- Km the concentration of substrate that gives half-maximal activity
- Km is intimately associated with the therapeutic efficacy of PAL in maintaining Phe levels within an acceptable range, i.e., from below the level of detection to between about 20 ⁇ M to 60 ⁇ M, preferably to less than about 20 ⁇ M, and even more preferably to less than about 10 ⁇ M, using standard detection methods well known in the art.
- Km is the affinity of the enzyme for the substrate. By controlling affinity, one can limit or control the efficacy of any enzyme against substrate at different concentrations.
- Km 1000 ⁇ M (e.g., PAL from Rhodosporidium toruloides)
- the activity of the enzyme will be reduced to about 12.5% at blood Phe levels of 240 ⁇ M and to about 3 % at blood Phe levels of 60 ⁇ M.
- Km is 240 ⁇ M
- the activity of the enzyme will be reduced to about 50% at blood Phe levels of 240 ⁇ M and to about 12 % at blood Phe levels of 60 ⁇ M.
- a preferred therapeutic objective would be to have a prokaryotic PAL enzyme with sufficient activity to reduce but also maintain Phe levels upon treatment within the range from below the level of detection to between about 20 ⁇ M to 60 ⁇ M, preferably to less than about 20 ⁇ M, and even more preferably to less than about 10 ⁇ M, using standard detection methods well known in the art.
- An enzyme with a Km of about 1000 ⁇ M will lose activity rapidly as Phe levels drop to within normal range (approximately 55-60 ⁇ M, see Kaufmann, Proc. Natl. Acad. Sci USA 96:3160-3164 (1999)) and will also require the impractical administration of highly concentrated or large volumes of doses.
- An enzyme with a lower Km may rapidly deplete Phe and maintain Phe levels upon treatment within a range from below the level of detection to between about 20 ⁇ M to 60 ⁇ M, preferably to less than about 20 ⁇ M, and even more preferably to less than about 10 ⁇ M, which may be useful in the management of cancer.
- the biologically active prokaryotic PAL variant has a kcat of at least about 0.1 s-1, preferably greater than about 0.5 s-1, and even more preferably greater than about 1.0 s-1. In most preferred embodiments, the biologically active prokaryotic PAL variant has a kcat of at least about 0.4 s-1, preferably greater than about 2.0 s-1, and even more preferably greater than about 4.0 s-1. In other preferred embodiments, the biologically active prokaryotic PAL variant has a Km of between about 10 ⁇ M to about 2000 ⁇ M. In more preferred embodiments, the biologically active prokaryotic PAL variant has a Km of between about 10 ⁇ M to about 1000 ⁇ M.
- the biologically active prokaryotic PAL variant has a Km of between about 10 ⁇ M to about 500 ⁇ M. In other preferred embodiments, the biologically active prokaryotic PAL variant exhibits enzymatic activity from about 50% of to about 10-fold times greater than the wild- type PAL. In other preferred embodiments, the biologically active prokaryotic PAL variant exhibits enzymatic activity from about 50% of to about 100% higher than the wild-type PAL.
- Such biological active prokaryotic PAL variants may be formed using methods well known in the art, such as by site-directed mutagenesis.
- a number of strategies are currently used to reduce protein immunogenicity. Preferably, modifications that are introduced to minimize the immune response do not destroy the structure, function, or stability of the macromolecule.
- Effective strategies used include increasing human sequence content (chimeras and/or other 'humanization' approaches), improving solution properties, removing antibody epitopes, introducing chemical derivatization (such as pegylation), and/or identifying and removing MHC agretopes.
- in vivo immunoreactivity can be addressed by performing epitope mapping followed by rational mutagenesis to modify and/or otherwise mutate these sites of immunogenicity, alone and in combination with site-specific pegylation (Hershfield, et al, Proc. Natl. Acad.
- Another method introduces point mutations for additional surface Lys sites for pegylation derivatization, a method shown to reduce immunogenicity with the test enzyme purine nucleoside phosphorylase (Hershfield, et al (1991), ibid.).
- An alternative pathway uses mutation of residues located in protein epitope regions to remove immunogenic sites (Yeung, et al, J. Immunol. 172(11):6658-6665 (2004)).
- homologous loop regions and/or residues from human antibodies are substituted into the corresponding loop regions of a homologous protein.
- Improving solution properties of proteins may increase specific enzyme activity and/or reduce immunogenicity.
- One solution property typical of bacterially expressed recombinant proteins is the formation of protein aggregates due, for example, to inter-chain disulfide bind formation, hydrophobic interactions and/or divalent cations (Chi, et al, Pharm. Res. 20(9): 1325-1336 (2003)). Aggregation of recombinantly expressed proteins can enhance the immune response (Hermeling, et al, Pharm. Res. 21(6):897-903 (2994); Schellekens, Nephrol. Dial. Transplant. 20(suppl 6):vi3-9 (2005)).
- One method of improvement involves substituting surface cysteine residues with other amino acid residues ⁇ e.g., serine) to minimize the possibility of formation of inter-chain disulfide bonds. For example, substitution of two surface cysteine residues with serine residues reduced the aggregation of chorismate lyase with minor effects on enzyme activity (Holden, et al. , Biochim. Biophys. Acta 1594(l):160-167 (2002)).
- the invention contemplates prokaryotic PAL variants having one or more cysteine residues substituted by another amino acid residue, preferably a serine residue. In some embodiments, one or more cysteine residues of the prokaryotic PAL are substituted by another amino acid residue. In preferred embodiments, the prokaryotic PAL is AvPAL. In more preferred embodiments, one or more cysteine residues of AvPAL are substituted by a cysteine residue.
- Macromolecule chemical modification can be performed in a non-specific fashion (leading to mixtures of derivatized species) or in a site-specific fashion (based on wild-type macromolecule reactivity-directed derivatization and/or site-selective modification using a combination of site-directed mutagenesis and chemical modification) or, alternatively, using expressed protein ligation methods (Hofmann, et al, Curr. Opin. Biotechnol. 13(4):297-303 (2002)).
- chemical modification is used to reduce immunogenicity.
- Pegylation is a demonstrated method to reduce immunogenicity of proteins (Bhadra, et al , Pharmazie 57(l):5-29 (2002)), but glycosylation and other chemical derivatization procedures, using modification with phosphorylation, amidation, carboxylation, acetylation, methylation, creation of acid-addition salts, amides, esters, and N-acyl derivatives are also possible (Davis, Science 303:480-482 (2004)). Methods for pegylating PAL proteins and for determining the optimal degree of pegylation are described in prior co-pending United States Patent Application Number 1 1/230,374 filed on September 19, 2005, which is herein incorporated by reference in its entirety.
- the invention contemplates prokaryotic PAL variants comprising a water-soluble polymer (i.e., polyethylene glycol or PEG).
- the invention contemplates introducing one or more lysine residues at/near the active site of a prokaryotic PAL variant to enhance catalytic activity, reduce immunogenicity and/or improve biochemical stability, in part by blocking potential pegylation of other amino acid residues (e.g., tyrosine) at/near the active site of the enzyme or by blocking potential pegylation of a lysine residue important for enzyme activity.
- a tyrosine residue at/near the active site of a prokaryotic PAL i.e., position 78 or 314 in AvPAL
- one or more amino acid residues at/near the active site of the prokaryotic PAL, which are not required for enzyme activity, are substituted by a lysine residue.
- the prokaryotic PAL is AvPAL.
- the AvPAL tyrosine residue at position 78 or 314 is not accessible for pegylation.
- a lysine residue of a prokaryotic PAL i.e., position 419 in AvPAL
- a prokaryotic PAL which is normally blocked from pegylation due to pegylation of a neighboring lysine residue PAL (i.e., position 413 in AvPAL)
- one or more amino acid residues of the prokaryotic PAL are substituted by a lysine residue, such that a lysine residue important for the enzyme's substrate binding and/or catalytic activity is not accessible for pegylation.
- the prokaryotic PAL is AvPAL.
- the AvPAL lysine residue at position 419 is not accessible for pegylation.
- Rhodosporidium toruloides Rhodosporidium toruloides
- NpPAL cyanobacterium Nostoc punctiforme
- AvPAL Anabaena variabilis
- Phe phenylalanine
- This animal model is a homozygous mutant at the phenylalanine hydroxylase gene (PAH) locus resulting in an animal with severe hyperphenylalanemia.
- the high plasma Phe levels make this animal the appropriate model for evaluating the ability of PAL to reduce plasma Phe.
- Administration of pegylated forms of NpPAL and AvPAL resulted in greater reduction in Phe in the ENU2 mice as compared to unpegylated NpPAL and AvPAL, respectively. Such effects were maintained for NpPAL upon weekly injections over a ten-week period.
- the administration of the pegylated AvPAL double cysteine mutant AvPAL_C565SC503S resulted in a reduction in plasma Phe that was comparable to that achieved with pegylated wild-type AvPAL.
- the anti-PAL antibody titers were lower in animals injected with pegylated AvPAL variant as compared to pegylated wild-type AvPAL.
- a pegylated AvPAL variant has (1) in vivo PAL enzyme activity that is comparable to the pegylated wild- type AvPAL, and (2) has reduced immunogenicity compared to the pegylated wild-type AvPAL.
- the present invention is directed to the treatment of cancer with methods that comprise the use of prokaryotic PAL compositions, either alone or in combination with other therapeutic regimens, for example and not for limitation, cancer therapeutic agents or targeted cancer therapeutic agents.
- prokaryotic PAL compositions may be used to treat that patient population with blood, serum or plasma, phenylalanine (Phe) concentrations at any level (e.g., from about 40 ⁇ M to and 2000 ⁇ M), where the normal range in human plasma is between about 55 ⁇ M and 60 ⁇ M (Kaufman, Proc. Natl. Acad. Sci. USA 96:3160-3164 (1999)).
- a "cancer therapeutic agent” as used herein refers to any compound, e.g., small molecule or peptide/polypeptide, which has been shown to exert a therapeutic effect (/. e. , inhibition of proliferation and/or survival) on cancer cells.
- the cancer therapeutic agent is a cytotoxic agent or a cytostatic agent.
- a “targeted cancer therapeutic agent” as used herein refers to any compound, e.g., small molecule or peptide/polypeptide, or polypeptide or conjugated polypeptide that has been shown to exert a therapeutic effect (i.e., inhibition of proliferation and/or survival) on specific cancer cells or tissues.
- the targeted cancer therapeutic agent is an antibody, a polypeptide having an antibody-like domain, or other polypeptide, e.g., enzyme, hormone, growth factor, cytokine, etc., which selectively binds to the surface of a target cell.
- the antibody, polypeptide having an antibody-like domain, or other polypeptide may be unconjugated or may be conjugated to a cancer therapeutic agent.
- the targeted cancer therapeutic agent can be a compound that exerts a therapeutic effect on specific cancer cells or tissues.
- the prokaryotic PAL compositions of the present invention are useful for treating any cancer for which Phe restriction or depletion inhibits its proliferation and/or survival.
- the identification of cancers for which treatment with the prokaryotic PAL compositions of the present invention may be useful can be made on the basis of in vitro culture experiments (see EXAMPLE 14) or in vivo human tumor xenograft studies in mice (see EXAMPLE 15) using, for example, a tumor biopsy specimen, or by comparison with tumor types with known or demonstrated sensitivity to Phe restriction or depletion in animal models of human cancer.
- the cancer is lung cancer, brain or central nervous system cancer, colon cancer, prostate cancer, renal cancer or metastatic melanoma.
- the cancer is head and neck cancer, uterine cancer, leukemia (e.g., acute myeloid leukemia or acute lymphoblastic leukemia) or myeloma.
- leukemia e.g., acute myeloid leukemia or acute lymphoblastic leukemia
- myeloma e.g., myeloma.
- the cancer is pediatric cancer or a resistant cancer (i.e., a cancer that has been shown to be resistant to cancer therapeutic agents or targeted cancer therapeutic agents).
- Certain embodiments of the present invention are directed to treating cancer by administering to the subject a composition comprising prokaryotic PAL or a biologically active fragment, mutant, variant or analog thereof in combination with a protein-restricted (i.e., phenylalanine-free) diet, wherein the combined administration of the prokaryotic PAL and the protein-restricted diet is effective to lower the Phe concentration in the blood, plasma or serum of said subject as compared to the concentration in the absence of said combined administration.
- a protein-restricted i.e., phenylalanine-free
- the methods of the invention will entail monitoring the plasma Phe concentration of the individual to be treated by prokaryotic PAL compositions.
- the patient is then treated by administering prokaryotic PAL compositions alone, or in combination with other therapeutic regimens, such as cancer therapeutic agents or targeted cancer therapeutic agents, or a combined regimen of prokaryotic PAL and a protein-restricted (i.e., phenylalanine-free) diet, such that there is produced at least a 10% decrease in the blood, plasma or serum Phe concentrations of the patient.
- the method will produce at least a 25%, and more preferably at least a 50% decrease in the blood, plasma or serum Phe concentration.
- the method will produce at least a 50%, 60%, 70%, 80%, 90%, 95% or greater decrease in the blood, serum or plasma Phe concentration of the individual (for example, where a patient with a plasma Phe concentration of 60 ⁇ M is treated, a 50%, 70% or 90% decrease in the Phe concentration will produce a plasma Phe concentration of 30 ⁇ M, 18 ⁇ M or 6 ⁇ M, respectively).
- the treatment methods of the present invention should attempt to lower the blood, serum or plasma Phe concentrations of the patient upon treatment to a range from below the level of detection to between about 20 ⁇ M to 60 ⁇ M, preferably to less than about 20 ⁇ M, and even more preferably to less than about 10 ⁇ M, using standard detection methods well known in the art.
- Parenteral, oral, or other standard routes of administration and dosage can be achieved using standard methods.
- the present invention contemplates therapeutic intervention of cancer. Such intervention is based initially on the use of prokaryotic PAL compositions, pharmaceutical compositions and formulations, which may be used alone or in combination with other therapeutic regimens, such as cancer therapeutic agents or targeted cancer therapeutic agents, or a combined regimen of a low protein diet (i.e., low phenylalanine) and prokaryotic PAL, or both. Further, prokaryotic PAL and/or dietary restrictions may be further combined with other therapeutic compositions that are designed, for example, to combat manifestations of low phenylalanine levels, such as, for example and not for limitation, tyrosine supplementation. This section provides a discussion of the compositions, pharmaceutical compositions and formulations that may be used in the treatments contemplated herein.
- the present invention contemplates pharmaceutical compositions comprising therapeutically effective amounts of prokaryotic PAL compositions of the invention together with one or more pharmaceutically acceptable excipients, vehicles diluents, stabilizers, preservatives, solubilizers, emulsifiers, adjuvants and/or carriers.
- Such pharmaceutical compositions include diluents of various buffer content ⁇ e.g., Tris-HCl, phosphate), pH and ionic strength; additives such as detergents and solubilizing agents ⁇ e.g., Polysorbate 20, Polysorbate 80), anti-oxidants ⁇ e.g., ascorbic acid, sodium metabisulfite), preservatives ⁇ e.g., Thimerosol, benzyl alcohol) and bulking substances ⁇ e.g., lactose, mannitol); see, e.g., Remington's Pharmaceutical Sciences, 18 th Edition (1990, Mack Publishing Co., Easton, Pa.) pages 1435:1712, which are herein incorporated by reference.
- An effective amount of active ingredient is a therapeutically, prophylactically, or diagnostically effective amount, which can be readily determined by a person skilled in the art by taking into consideration such factors as body weight, age, and therapeutic goal.
- the prokaryotic PAL pharmaceutical compositions of the present invention may include a buffering agent to maintain the pH of the solution within a desired range.
- Preferred buffering agents include Tris-HCl, sodium acetate, sodium phosphate, and sodium citrate. Mixtures of these buffering agents may also be used.
- the amount of buffering agent useful in the composition depends largely on the particular buffer used and the pH of the solution. For example, acetate is a more efficient buffer at pH 5 than pH 6 so less acetate may be used in a solution at pH 5 than at pH 6.
- a more preferred buffering agent is Tris-HCl.
- a preferred pH range for the pharmaceutical compositions of the present invention is about pH 6.0-8.5.
- a more preferred pH range for the pharmaceutical compositions of the present invention is about pH 7.0-8.0.
- a most preferred pH range for the pharmaceutical compositions of the present invention is about pH 7.0-7.6.
- compositions of the present invention may further include an isotonicity-adjusting agent to render the solution isotonic and more compatible for injection.
- a preferred agent is sodium chloride within a concentration range of 50-200 mM.
- a more preferred agent is sodium chloride within a concentration range of 100-150 mM.
- a most preferred agent is sodium chloride within a concentration range of 130-150 mM.
- Pharmaceutically acceptable carriers or excipients may include stabilizers, which are molecules that stabilize the prokaryotic PAL compositions of the invention.
- stabilize is meant to include, for example and not for limitation, increasing the shelf-life of a prokaryotic PAL enzyme, protecting the prokaryotic PAL enzyme from proteolytic digestion, maintaining the prokaryotic PAL enzyme in an active conformation, and preserving the prokaryotic PAL enzyme activity upon storage at elevated temperatures.
- Stabilizers of the present invention include L-phenylalanine (Phe) and structural analogs thereof, such as trans-cinnamic acid (t-CA), benzoic acid, tyrosine (Tyr), and the like.
- Loss of activity of a plant PAL from Phaseolus vulgaris (PvPAL) has been shown upon removal of its substrate L-phenylalanine after affinity purification (Da Cunha, Eur. J. Biochem. 178:243-248 (1988)), and a yeast PAL from Rhodosporidium toruloides (RtPAL) has been shown to be protected from protease inactivation by tyrosine (Wang, et al., MoI. Genet. Metab.
- Phe and certain of its structural analogs have the ability to stabilize PEG:PAL conjugates of a prokaryotic PAL from Anabaena variabilis (AvPAL) (see EXAMPLE 11).
- AvPAL Anabaena variabilis
- the prokaryotic PAL enzyme is more stable as an enzyme-substrate complex, wherein the bound substrate Phe is converted to the product t-CA or to a transition state analog of t-CA.
- the t-CA remains bound to the otherwise highly reactive active site center (MIO group), thereby stabilizing the PAL enzyme.
- the PAL enzyme substrate, Phe, product, t-CA, or structural analogs thereof are stabilizers of the invention.
- the invention contemplates a pharmaceutical composition comprising a prokaryotic PAL variant and a pharmaceutically acceptable carrier, wherein the pharmaceutically acceptable carrier comprises a stabilizer.
- the stabilizer is Phe or structural analog thereof.
- the stabilizer is selected from the group consisting of L-phenylalanine, trans- cinnamic acid and benzoic acid.
- a preferred range for the stabilizers of the invention is from about 0.1 to 20 moles of stabilizer per mole active site of prokaryotic PAL.
- a more preferred range for the stabilizers of the invention is from about 0.5 to 10 moles of stabilizer per mole active site of prokaryotic PAL.
- a most preferred range for the stabilizers of the invention is from about 1 to 10 moles of stabilizer per mole active site of prokaryotic PAL.
- the pharmaceutical composition comprises a prokaryotic PAL variant and a pharmaceutically acceptable carrier, wherein the prokaryotic PAL variant has a greater phenylalanine-converting activity and/or a reduced immunogenicity as compared to a wild-type PAL and is effective in reducing the Phe concentration in the blood, serum or plasma of the subject to a range from below the level of detection to between about 20 ⁇ M to 60 ⁇ M, preferably to less than about 20 ⁇ M, and even more preferably to less than about 10 ⁇ M, and wherein the pharmaceutically acceptable carrier comprises a stabilizer.
- the stabilizer is Phe or structural analog thereof.
- the stabilizer is selected from the group consisting of L-phenylalanine, trans-cinnamic acid and benzoic acid.
- the pharmaceutical composition comprises a prokaryotic PAL variant and a pharmaceutically acceptable carrier, wherein the prokaryotic PAL variant is an Anabaena variabilis PAL (AvPAL) variant, wherein the cysteine residues at positions 503 and 565 of the AvPAL variant have been substituted by serine residues, the AvPAL variant further comprises a water-soluble polymer of polyethylene glycol, wherein the ratio of AvPAL variant and the polyethylene glycol is about 1 :3; and the AvPAL variant is effective in reducing the phenylalanine concentration in the blood, serum or plasma of the subject to a range from below the level of detection to between about 20 ⁇ M to 60 ⁇ M, preferably to less than about 20 ⁇ M, and even more preferably to less than about 10 ⁇ M, and wherein the pharmaceutically acceptable carrier comprises a stabilizer.
- the stabilizer is Phe or structural analog thereof.
- the stabilizer is selected from the group consisting of L
- a therapeutically effective amount refers to an amount that is effective to produce the intended beneficial effect on health of a cancer patient.
- a therapeutically effective amount of a prokaryotic PAL variant gives a decrease in blood, plasma or serum, preferably plasma, L-phenylalanine levels that provides benefit to the patient. The amount will vary from one individual to another and will depend upon a number of factors, including the overall physical condition of the patient, diet and disease state.
- the amount of prokaryotic PAL used for therapy gives an acceptable decrease in blood, plasma or serum, preferably plasma, L-phenylalanine levels, and maintains this value during PAL treatment at a beneficial level (typically in a range from less than about 5% to between about 35% and 100%, preferably in a range from less than about 5% to about 35%, and even more preferably in a range from less than about 5% to about 15% of the normal range of blood, plasma or serum, preferably plasma, L-phenylalanine).
- a beneficial level typically in a range from less than about 5% to between about 35% and 100%, preferably in a range from less than about 5% to about 35%, and even more preferably in a range from less than about 5% to about 15% of the normal range of blood, plasma or serum, preferably plasma, L-phenylalanine).
- a therapeutically effective amount of a prokaryotic PAL variant reduces tumor growth, tumor size or tumor burden by greater than about 10%, 30%, 50%, 70%, 90%, 95%, 98% or 99% in a treated patient as compared to an untreated patient.
- a therapeutically effective amount of a prokaryotic PAL variant maintains the tumor in static condition in a treated patient as compared to an untreated patient.
- a therapeutically effective amount of a prokaryotic PAL variant increases survival time or disease-free time at least about 10%, 20%, 50%, 100%, 2-fold, 5-fold or 10-fold longer in a treated patient as compared to an untreated patient.
- a therapeutically effective amount of the prokaryotic PAL variant compositions of the invention may be readily ascertained by one skilled in the art using publicly available materials and procedures.
- the invention provides for administering prokaryotic PAL variants less frequently than native PAL.
- the dosing frequency will vary depending upon the condition being treated, but in general will be about one time per week. It is understood that the dosing frequencies actually used may vary somewhat from the frequencies disclosed herein due to variations in responses by different individuals to the prokaryotic PAL variants; the term "about” is intended to reflect such variations. It is contemplated that the prokaryotic PAL variants are administered about two times per week, about one time per week, about one time every two weeks, about one time per month, or longer than about one time per month.
- the present invention may thus be used to reduce blood, plasma or serum L- phenylalanine levels.
- Numerous cancer-related conditions, where depletion of blood, plasma or serum L-phenylalanine levels would be beneficial, may be treated with the prokaryotic PAL variant pharmaceutical compositions of the invention.
- prokaryotic PAL pharmaceutical compositions prepared in accordance with the present invention are preferably administered by parenteral injection, either intravenously, intraperitoneally, subcutaneously, intramuscularly, intraarterially or intrathecally.
- parenteral injection either intravenously, intraperitoneally, subcutaneously, intramuscularly, intraarterially or intrathecally.
- other routes of delivery could also be effectively utilized using the pharmaceutical compositions of the present invention.
- prokaryotic PAL pharmaceutical compositions comprising the molecules described above, together with one or more pharmaceutically acceptable excipients, vehicles, diluents, stabilizers, preservatives, solubilizers, emulsifiers, adjuvants and/or carriers, and optionally other therapeutic and/or prophylactic ingredients.
- excipients include liquids such as water, saline, glycerol, polyethylene glycol, hyaluronic acid, ethanol, cyclodextrins, modified cyclodextrins (i.e., sufobutyl ether cyclodextrins), etc.
- Suitable excipients for non-liquid formulations are also known to those of skill in the art.
- compositions of the present invention include, for example, mineral acid salts such as hydrochlorides, hydrobromides, phosphates, sulfates, and the like; and the salts of organic acids such as acetates, propionates, malonates, benzoates, and the like.
- mineral acid salts such as hydrochlorides, hydrobromides, phosphates, sulfates, and the like
- organic acids such as acetates, propionates, malonates, benzoates, and the like.
- auxiliary substances such as wetting or emulsifying agents, biological buffering substances, surfactants, and the like, may be present in such vehicles.
- a biological buffer can be virtually any solution which is pharmacologically acceptable and which provides the formulation with the desired pH, /. e. , a pH in the physiologically acceptable range. Examples of buffer solutions include saline, phosphate buffered saline, Tris buffered saline, Hank's buffered saline, and the like.
- the pharmaceutical compositions may be in the form of solid, semi-solid or liquid dosage forms, such as, for example, tablets, suppositories, pills, capsules, powders, liquids, suspensions, creams, ointments, lotions or the like, preferably in unit dosage form suitable for single administration of a precise dosage.
- the compositions will include a therapeutically effective amount of the prokaryotic PAL in combination with a pharmaceutically acceptable carrier and, in addition, may include other pharmaceutical agents, adjuvants, diluents, buffers, etc.
- the prokaryotic PAL pharmaceutical compositions of this invention will be administered as pharmaceutical formulations including those suitable for oral (including buccal and sub-lingual), rectal, nasal, topical, pulmonary, vaginal or parenteral (including intramuscular, intraarterial, intrathecal, subcutaneous and intravenous) administration or in a form suitable for administration by inhalation or insufflation.
- oral including buccal and sub-lingual
- rectal including intramuscular, intraarterial, intrathecal, subcutaneous and intravenous
- parenteral including intramuscular, intraarterial, intrathecal, subcutaneous and intravenous
- administration by inhalation or insufflation is intravenous using a convenient daily dosage regimen, which can be adjusted according to the degree of affliction.
- conventional nontoxic solid carriers include, for example, pharmaceutical grades of mannitol, lactose, starch, magnesium stearate, sodium saccharin, talc, cellulose, glucose, sucrose, magnesium carbonate, and the like.
- Liquid pharmaceutically administrable compositions can, for example, be prepared by dissolving, dispersing, etc., a prokaryotic PAL variant composition as described herein and optional pharmaceutical adjuvants in an excipient, such as, for example, water, saline, aqueous dextrose, glycerol, ethanol, and the like, to thereby form a solution or suspension.
- the pharmaceutical composition to be administered may also contain minor amounts of nontoxic auxiliary substances such as wetting or emulsifying agents, pH buffering agents, tonicifying agents, and the like, for example, sodium acetate, sorbitan monolaurate, triethanolamine sodium acetate, triethanolamine oleate, etc.
- auxiliary substances such as wetting or emulsifying agents, pH buffering agents, tonicifying agents, and the like, for example, sodium acetate, sorbitan monolaurate, triethanolamine sodium acetate, triethanolamine oleate, etc.
- the composition will generally take the form of a tablet, capsule, or softgel capsule, or may be an aqueous or nonaqueous solution, suspension or syrup. Tablets and capsules are preferred oral administration forms. Tablets and capsules for oral use will generally include one or more commonly used carriers such as lactose and corn starch. Lubricating agents, such as magnesium stearate, are also typically added. When liquid suspensions are used, the active agent may be combined with emulsifying and suspending agents. If desired, flavoring, coloring and/or sweetening agents may be added as well. Other optional components for incorporation into an oral formulation herein include, but are not limited to, preservatives, suspending agents, thickening agents, and the like.
- Parenteral formulations can be prepared in conventional forms, either as liquid solutions or suspensions, solid or lyophilized forms suitable for reconstitution, solubilization or suspension in liquid prior to injection, or as emulsions.
- sterile injectable suspensions are formulated according to techniques known in the art using suitable carriers, dispersing or wetting agents and suspending agents.
- the sterile injectable formulation may also be a sterile injectable solution or a suspension in a nontoxic parenterally acceptable diluent or solvent.
- acceptable vehicles and solvents that may be employed are water, Ringer's solution and isotonic sodium chloride solution.
- the prokaryotic PAL compositions of the invention described herein can be administered to a patient at therapeutically effective doses to treat cancer.
- the toxicity and therapeutic efficacy of such prokaryotic PAL compositions can be determined by standard pharmaceutical procedures in cell cultures or experimental animals, such as, for example, by determining the LD 50 (the dose lethal to 50% of the population) and the ED 5O (the dose therapeutically effective in 50% of the population).
- the dose ratio between toxic and therapeutic effects is the therapeutic index and it can be expressed as the ratio LD 5O /ED 50 .
- Prokaryotic PAL compositions exhibiting large therapeutic indices are normally preferred.
- the data obtained from the cell culture assays and animal studies can be used in formulating a range of dosage for use in humans.
- the dosage preferably lies within a range of circulating concentrations that include the ED 50 with little or minimal toxicity.
- the dosage can vary within this range depending upon the dosage form employed and the route of administration utilized.
- the therapeutically effective dose or amount can be determined from cell culture assays, and from animal models.
- the dietary protein of the patients also may be restricted or modified.
- Those of skill in the art are aware of various commercially available protein formulas for use in the treatment of PKU. Such formulas include MAXIMAID, PHENEX 1, PHENEX 2 (Ross Laboratories, Liverpool, UK), LOFENALAC, PHENYL-FREE (Mead- Johnson), and the like.
- protein formulas which are generally free of Phe concentrations.
- the protein formulas often are supplemented with amino acids that are deficient in PKU patients.
- amino acids include, for example, L- tyrosine, and L-glutamine.
- L-carnitine and taurine which are normally found in human milk and other foodstuffs of animal origin, also should be supplied in addition to the protein restriction.
- the L-carnitine may be supplied as 20 mg/100 g of protein supplement
- the taurine may be supplied as 40 mg/100 g protein supplement in order to help supply amounts of these factors normally found in human milk and foods of animal origin.
- those of skill in the art are referred to the 2000 National Academy of Sciences-National Research Council Dietary Reference Intakes for a further listing of other components, such as essential vitamins and minerals that should be supplied to the patient to ensure that other supplements are being provided despite the dietary protein restriction.
- determining whether the methods of the invention are effective will entail determining the plasma Phe concentrations of the patient on a regular basis to ensure that the plasma Phe concentrations remain in a range from below the level of detection to between about 20 ⁇ M to 60 ⁇ M, preferably to less than about 20 ⁇ M, and even more preferably to less than about 10 ⁇ M. Tests for determining such concentrations are described below. Preferably, concentrations of less than the level of detection to between about 20 ⁇ M to 60 ⁇ M are achieved, more preferably to less than about 20 ⁇ M, and even more preferably to less than about 10 ⁇ M.
- the invention provides a method for treating cancer comprising administering to a subject in need of such treatment a therapeutically effective amount of a pharmaceutical composition comprising a prokaryotic phenylalanine ammonia- lyase (PAL) variant and a pharmaceutically acceptable carrier, wherein the PAL variant has a greater phenylalanine-converting activity and/or a reduced immunogenicity as compared to a wild-type PAL, and is effective in reducing the phenylalanine concentration in the blood, serum or plasma of the subject to a range from below the level of detection to between about 20 ⁇ M to 60 ⁇ M, preferably to less than about 20 ⁇ M, and even more preferably to less than about 10 ⁇ M, and further comprising administering to the subject a protein-restricted (i.e., phenylalanine-free) diet.
- a pharmaceutical composition comprising a prokaryotic phenylalanine ammonia- lyase (PAL) variant and a pharmaceutically acceptable carrier
- Certain methods of the invention involve the combined use of prokaryotic PAL and dietary protein restriction to effect a therapeutic outcome in patients with various forms of cancer.
- the prokaryotic PAL composition and the dietary restriction in a combined amount effective to produce the desired therapeutic outcome (i.e., a lowering of plasma Phe concentration to a range from below the level of detection to optimally about 20 ⁇ M to 60 ⁇ M, preferably to less than about 20 ⁇ M, and even more preferably to less than about 10 ⁇ M, using standard detection methods well known in the art).
- This process may involve administering the prokaryotic PAL composition and the dietary protein therapeutic composition at the same time.
- compositions or pharmacological protein formulation that includes all of the dietary protein requirements and also includes the prokaryotic PAL within said protein formulation.
- the dietary protein supply or normal protein meal
- a pharmacological formulation tablette or injection or drink
- Prokaryotic PAL also may be formulated into a protein bar or other foodstuff such as brownies, pancakes, cake, suitable for ingestion.
- tyrosine is an essential amino acid for such patients. Therefore, dietary supplementation with tyrosine may be desirable for patients receiving prokaryotic PAL alone in combination with the dietary protein therapy.
- prokaryotic PAL treatment may precede or follow the dietary protein therapy by intervals ranging from minutes to hours.
- the protein and the prokaryotic PAL compositions are administered separately, one would generally ensure that a significant period of time did not expire between the time of each delivery, such that PAL will still be able to exert an advantageously effect on the patient.
- PAL therapy will be a continuous therapy where a daily dose of PAL is administered to the patient indefinitely.
- compositions that specifically targets one or more of the symptoms of cancer.
- compositions include, for example and not for limitation, cancer therapeutic agents and targeted cancer therapeutic agents.
- any agent that exerts a therapeutic effect on cancer cells i.e., inhibition of proliferation and/or survival
- the cancer therapeutic agent is a cytotoxic agent or a cytostatic agent.
- the cancer therapeutic agent can be administered as a cancer co-therapy with the prokaryotic PAL compositions of the invention.
- Cancer co-therapy means that the cancer therapeutic agent and the prokaryotic PAL composition are administered simultaneously or sequentially, either the cancer therapeutic agent followed by the prokaryotic PAL composition, or vice versa.
- cytotoxic agents include, for example, antitubulin agents, auristatins, DNA minor groove binders, DNA replication inhibitors, alkylating agents (e.g., platinum complexes such as cis-platin, mono(platinum), bis(platinum) and tri-nuclear platinum complexes and-carboplatin), anthracyclines, antibiotics, antifolates, antimetabolites, chemotherapy sensitizers, duocarmycins, etoposides, fluorinated pyrimidines, ionophores, lexitropsins, nitrosoureas, platinols, pre-forming compounds, purine antimetabolites, puromycins, radiation sensitizers, steroids, taxanes, topoisomerase inhibitors, vinca alkaloids, and the like.
- alkylating agents e.g., platinum complexes such as cis-platin, mono(platinum), bis(platinum) and tri-nu
- Individual cytotoxic agents include, for example, an androgen, anthramycin (AMC), asparaginase, 5-azacytidine, azathioprine, bleomycin, busulfan, buthionine sulfoximine, camptothecin, carboplatin, carmustine (BSNU), CC- 1065, chlorambucil, cisplatin, colchicine, cyclophosphamide, cytarabine, cytidine arabinoside, cytochalasin B, dacarbazine, dactinomycin (formerly actinomycin), daunorubicin, decarbazine, docetaxel, doxorubicin, an estrogen, 5-fluordeoxyuridine, 5-fluorouracil, gramicidin D, hydroxyurea, idarubicin, ifosfamide, irinotecan, lomustine (CCNU), mechlorethamine, melphal
- the cancer therapeutic agent is a cytotoxic agent.
- Suitable cytotoxic agents include, for example, dolastatins (e.g. , auristatin E, AFP, MMAF, MMAE), DNA minor groove binders (e.g., enediynes and lexitropsins), duocarmycins, taxanes (e.g., paclitaxel and docetaxel), puromycins, vinca alkaloids, CC-1065, SN-38, topotecan, morpholino-doxorubicin, rhizoxin, cyanomorpholino-doxorubicin, echinomycin, combretastatin, netropsin, epothilone A and B, estramustine, cryptophysins, cemadotin, maytansinoids, discodermolide, eleutherobin, and mitoxantrone.
- dolastatins e.g. , auristat
- the cytotoxic agent is a conventional chemotherapeutic such as, for example, doxorubicin, paclitaxel, melphalan, vinca alkaloids, methotrexate, mitomycin C or etoposide.
- chemotherapeutic such as, for example, doxorubicin, paclitaxel, melphalan, vinca alkaloids, methotrexate, mitomycin C or etoposide.
- potent agents such as CC- 1065 analogues, calicheamicin, maytansine, analogues of dolastatin 10, rhizoxin, and palytoxin can be used.
- the cytotoxic agent is a DNA minor groove binding agent, for example, a CBI compound or an enediyne (e.g. , calicheamicin).
- the cancer therapeutic agent is an anti-tubulin agent.
- anti-tubulin agents include, but are not limited to, taxanes (e.g., TAXOL (paclitaxel), TAXOTERE (docetaxel)), T67 (Tularik), vinca alkyloids (e.g., vincristine, vinblastine, vindesine, and vinorelbine), and dolastatins (e.g., auristatin E, AFP, MMAF, MMAE, AEB, AEVB).
- taxanes e.g., TAXOL (paclitaxel), TAXOTERE (docetaxel)
- T67 Tularik
- vinca alkyloids e.g., vincristine, vinblastine, vindesine, and vinorelbine
- dolastatins e.g., auristatin E, AFP, MMAF, MMAE, AEB, AEVB
- antitubulin agents include, for example, baccatin derivatives, taxane analogs (e.g., epothilone A and B), nocodazole, colchicine and colcimid, estramustine, cryptophysins, cemadotin, maytansinoids, combretastatins, discodermolide, and eleutherobin.
- the cytotoxic agent is a maytansinoid, another group of anti-tubulin agents, for example, maytansine or DM-I .
- the cancer therapeutic agent is a radioisotope. In certain other embodiments, the cancer therapeutic agent is not a radioisotope.
- the cytotoxic agent is an antimetabolite.
- the antimetabolite can be, for example, a purine antagonist (e.g., azothioprine or mycophenolate mofetil), a dihydrofolate reductase inhibitor (e.g., methotrexate), acyclovir, gangcyclovir, zidovudine, vidarabine, ribavarin, azidothymidine, cytidine arabinoside, amantadine, dideoxyuridine, iododeoxyuridine, poscarnet, or trifluridine.
- a purine antagonist e.g., azothioprine or mycophenolate mofetil
- a dihydrofolate reductase inhibitor e.g., methotrexate
- acyclovir gangcyclovir
- zidovudine vidarabine
- ribavarin azidothymidine
- the cytotoxic agent is tacrolimus, cyclosporine or rapamycin.
- the cytoxic agent is aldesleukin, alemtuzumab, alitretinoin, allopurinol, altretamine, amifostine, anastrozole, arsenic trioxide, bexarotene, bexarotene, calusterone, capecitabine, celecoxib, cladribine, Darbepoetin alfa, Denileukin diftitox, dexrazoxane, dromostanolone propionate, epirubicin, Epoetin alfa, estramustine, exemestane, Filgrastim, floxuridine, fludarabine, fulvestrant, gemcitabine, gemtuzumab ozogamicin, goserelin, idarubicin, ifosfamide, imat
- the invention provides a method for treating cancer comprising administering to a subject in need of such treatment a therapeutically effective amount of a pharmaceutical composition comprising a prokaryotic phenylalanine ammonia- lyase (PAL) variant and a pharmaceutically acceptable carrier, wherein the PAL variant has a greater phenylalanine-converting activity and/or a reduced immunogenicity as compared to a wild-type PAL, and is effective in reducing the Phe concentration in the blood, serum or plasma of the subject to a range from below the level of detection to between about 20 ⁇ M to 60 ⁇ M, preferably to less than about 20 ⁇ M, and even more preferably to less than about 10 ⁇ M, and further comprising administering a therapeutically effective amount of a pharmaceutical composition comprising a cancer therapeutic agent.
- PAL prokaryotic phenylalanine ammonia- lyase
- any agent that exerts a therapeutic effect on specific cancer cells can be used as the targeted cancer therapeutic agent in combination with the prokaryotic PAL compositions of the invention.
- the targeted cancer therapeutic agent is an antibody or an enzyme or protein that binds selectively to particular type of tumor cells or tissues, for example and not for limitation, by virtue of having an antibody-like targeting domain or via receptor-mediated binding.
- the antibody, polypeptide having an antibody-like targeting domain, enzyme or protein can be radiolabeled, or can be conjugated to a toxin or other agent that is able to exert a cytotoxic or cytostatic effect on the targeted cells or tissues.
- the targeted cancer therapeutic agent can be an agent that exerts a therapeutic effect on specific cancer cells or tissues (i.e., inhibition of proliferation and/or survival) by virtue of inhibiting or activating a protein, for example and not for limitation, an enzyme or a receptor, which is preferentially expressed or active in that particular type of tumor cell or tissue.
- a protein for example and not for limitation, an enzyme or a receptor, which is preferentially expressed or active in that particular type of tumor cell or tissue.
- the targeted cancer therapeutic agent can be administered as a targeted cancer co- therapy with the prokaryotic PAL compositions of the invention.
- “Targeted cancer co- therapy” means that the targeted cancer therapeutic agent and the prokaryotic PAL composition are administered simultaneously or sequentially, either the targeted cancer therapeutic agent followed by the prokaryotic PAL composition, or vice versa.
- the targeted cancer therapeutic agent is a humanized anti HER2 monoclonal antibody, RITUXAN (rituximab; Genentech; a chimeric anti CD20 monoclonal antibody); OVAREX (AltaRex Corporation, MA); PANOREX (Glaxo Wellcome, NC; a murine IgG2a antibody); Cetuximab Erbitux (Imclone Systems Inc., NY; an anti-EGFR IgG chimeric antibody); Vitaxin (Medlmmune, Inc., MD; Campath I/H (Leukosite, MA; a humanized IgGl antibody); Smart MI95 (Protein Design Labs, Inc., CA; a humanized anti-CD33 IgG antibody); LymphoCide (Immunomedics, Inc., NJ; a humanized anti-CD22 IgG antibody); Smart IDlO (Protein Design Labs, Inc., CA; a humanized anti- H
- Suitable antibodies include, but are not limited to, antibodies against the following antigens: CA125, CA 15-3, CA19-9, L6, Lewis Y, Lewis X, alpha fetoprotein, CA 242, placental alkaline phosphatase, prostate specific antigen, prostatic acid phosphatase, epidermal growth factor, MAGE-I, M AGE-2, MAGE-3, MAGE-4, anti transferrin receptor, p97, MUCl-KLH, CEA, gplOO, MARTl, Prostate Specific Antigen, IL-2 receptor, CD20, CD52, CD33, CD22, human chorionic gonadotropin, CD38, CD40, mucin, P21, MPG, and Neu oncogene product.
- antigens include, but are not limited to, antibodies against the following antigens: CA125, CA 15-3, CA19-9, L6, Lewis Y, Lewis X, alpha fetoprotein, CA 242, placental alkaline phosphatase,
- the targeted cancer therapeutic agent is an enzyme or other protein having an antibody-like targeting domain or having the ability to selectively bind to particular cells or tissues (e.g., by ligand-receptor binding).
- protein having an antibody-like targeting domain, enzyme or other protein is conjugated to a cancer therapeutic agent, for example, a compound or peptide/polypeptide, such as a toxin e.g., ricin, Diptheria toxin, Pseudomonas endotoxin, and the like (Kreitman, AAPS J. 8(3):E532-E551 (2006)) or other agent that is able to exert a cytotoxic or cytostatic effect on the targeted cells or tissues.
- a cancer therapeutic agent for example, a compound or peptide/polypeptide, such as a toxin e.g., ricin, Diptheria toxin, Pseudomonas endotoxin, and the like (Kreitman, AAPS J. 8(3):
- the targeted cancer therapeutic agent is compound ⁇ e.g., small molecule or peptide/polypeptide) that exerts a therapeutic effect on specific cancer cells or tissues, e.g., a serine/threonine kinase inhibitor, a tyrosine kinase inhibitor, a nuclear receptor agonist, a nuclear receptor antagonist, and the like.
- the invention provides a method for treating cancer comprising administering to a subject in need of such treatment a therapeutically effective amount of a pharmaceutical composition comprising a prokaryotic phenylalanine ammonia- lyase (PAL) variant and a pharmaceutically acceptable carrier, wherein the PAL variant has a greater phenylalanine-converting activity and/or a reduced immunogenicity as compared to a wild-type PAL, and is effective in reducing the Phe concentration in the blood, serum or plasma of the subject to a range from below the level of detection to between about 20 ⁇ M to 60 ⁇ M, preferably to less than about 20 ⁇ M, and even more preferably to less than about 10 ⁇ M, and further comprising administering a therapeutically effective amount of a pharmaceutical composition comprising a targeted cancer therapeutic agent.
- PAL prokaryotic phenylalanine ammonia- lyase
- tumor cells e.g., from a tumor biopsy or clinical aspirate
- a prokaryotic PAL composition or in the absence or presence of a phenylalanine-deficient medium
- a phenylalanine-deficient medium can be performed using protocols known in the art (see, for example, Abell, et al, Cancer Res. 32:285-290 (1972); Stith, et al, Cancer Res. 33:966-971 (1973); Fu, et al, Cancer Res. 59:758-765 (1999); Fu, et al, J. Cell. Physiol. 209:522-534 (2006); Elstad, et al, Nutr. Cancer 25:47-60 (1996); Nunez, et al, Cancer Lett. 236:133-141 (2006)). See also EXAMPLE 14.
- Tumor types with known or demonstrated dependence on Phe for its growth and its sensitivity to Phe restriction or depletion in animal models of human cancer include, for example, leukemia, metastatic myeloma, and androgen-independent prostate cancer (Abell, et al, (1973), ibid. ; Shen, et al, (1977), ibid.; Fu, et al, (1998), ibid. ; ⁇ u, et al, (2003), ibid; Meadows, et al, (1982), ibid. ; Elstad, et al, (1993), ibid).
- EXAMPLE 14 shows that the proliferation and/or survival of tumor cells derived from lung cancer, brain or central nervous system cancer, colon cancer, prostate cancer, renal cancer, metastatic melanoma, head and neck cancer, uterine cancer, leukemia (e.g., acute myeloid leukemia or acute lymphoblastoid leukemia) and myeloma is sensitive to Phe restriction upon incubation with a prokaryotic PAL composition of the present invention.
- leukemia e.g., acute myeloid leukemia or acute lymphoblastoid leukemia
- myeloma is sensitive to Phe restriction upon incubation with a prokaryotic PAL composition of the present invention.
- Another aspect of the invention is a method of producing prokaryotic PAL or biologically active fragment, mutant variant or analog thereof.
- recombinant prokaryotic PAL or a biologically active fragment, mutant, variant or analog thereof is over-expressed, with or without an N-terminal tag (e.g., octahistidyl-tag), in a vector, preferably pIBXl (Su, et al, Appl. Environ. Microbiol.
- pET28a Invitrogen
- an inducible promoter such as with IPTG (isopropyl-beta-D- thiogalactopyranoside), in E. coli BLR(DE3)/pLysS (Novagen) or E. coli BL21(DE3)/pLysS (Invitrogen) cells.
- Seed culture for a bioreactor/fermenter is grown from a glycerol stock in shake flasks. Such seed culture is then used to spike into a controlled bioreactor in fed-batch mode. Glucose is supplemented and pH is controlled with base (NH40H) and agitation is up to 1200 rpm.
- O 2 feed keeps dissolved oxygen to greater than 20%.
- the cells are grown at a temperature of 37°C until reaching an OD 6 oo of 70-100 (-22-25 hrs) and then induced with 0.4 mM IPTG. The temperature is reduced to 30°C and grown until activity change is ⁇ 0.1 ILVmL (approximately 40-48 hrs and an OD 60O typically of 200).
- Cell culture media is typically defined and composed of yeast extract protein, peptone-tryptone, glucose, glycerol, casamino acids, trace salts and phosphate buffering salts.
- the recombinant prokaryotic PAL product or biologically active fragment, mutant, variant or analog thereof is produced intra- cellularly and not secreted.
- the bacteria are harvested by continuous centrifugation (Alfa- Laval, Carr, Ceba, or equivalent).
- a further aspect of the present invention features a method to purify prokaryotic PAL or a biologically active fragment, mutant, variant or analog thereof.
- a transformed cell mass is grown and ruptured leaving crude recombinant enzyme. Exogenous materials are normally separated from the crude bulk to prevent fouling of the columns. Chromatographic purification is conducted using one or several chromatographic resins. Subsequently, the purified protein is formulated into a buffer designed to provide stable activity over an extended period of time.
- the method to purify the prokaryotic PAL or biologically active fragment, mutant, variant or analog thereof comprises: (a) lysis of the bacteria containing recombinant prokaryotic PAL or biologically active fragment, mutant, variant or analog thereof using a pressure homogenizer (but potentially by other physical means such as glass bead lysis); (b) heat treatment; (c) clarification of this lysate using a second continuous centrifugation step and/or depth filtration (as with Cuono Zeta Plus or Maximizer, Pall Filtron, or Millipore Millistak or Opticao filters); (d) passage through a charcoal filtration step (as with Millipore Millistak 40AC); (e) passage through a final filtration step (as with a Sartorious Sartopore 0.2 ⁇ m filter); (f) passage over a butyl hydrophobic interaction chromatography (as in Toyopearl Butyl 650M from Tosoh Biosciences); (g) passage over a butyl
- N. punctiforme genomic DNA was purchased from ATCC (29133D) and the PAL gene (ZP_00105927) was PCR-amplified from primers 5'-
- Primer 1 (5'-CACTGTGCTAGCATGAAGACACTATCTCAAGCACAAAG-S') (SEQ ID NO: 14) and primer 2 (5'-
- CACTGTGCGGCCGCTTAATGCAAGCAGGGTAAGATATCTTG-S' (SEQ ID NO: 17) were used to amplify nucleotides 1142-1771. These two PCR products were combined to amplify the full-length gene with primers 1 and 4. The resulting PCR product was digested with Nhel, blunted with Klenow (NEB), then digested with Notl. The 1.7 kb fragment was ligated into pET-28a(+) and pET-30a(+) (Novagen). This plasmid was named 3p86-23.
- A. variabilis PAL (AvPAL) gene was also cloned into the vector pIBX7 (Tkalec, et al, Appl. Environ. Microbiol. 66:29-35 (2000)), which was derived from pIBXl (Su, et al, Appl. Environ. Microbiol. 62:2723-2734 (1996)) (see EXAMPLE 7).
- N. punctiforme PAL E. coli BL21(DE3) cells (Stratagene) were transformed with pGro7 (TaKaRa) and competent BL21(DE3)pGro7 cells were prepared by the Inoue Method (Sambrook and Russell, Molecular Cloning: A Laboratory Manual, 3 rd Edition (Cold Spring Harbor Laboratory Press, Cold Spring Harbor, 2001)). These cells were transformed with pET-28-NpPAL and cultured in 25 mL LB with 50 mg/L kanamycin and 20 mg/L chloramphenicol overnight at 37 0 C.
- BL21 (DE3)pLysS cells (Stratagene) were transformed with AvPAL and cultured identically to NpPAL without the arabinose induction.
- AvPAL cloned in the pIBX7 vector was introduced by transformation into BLR(DE3)/pLysS (Novagen) cells and cultured in 25 mL LB with 50 mg/L kanamycin overnight at 37 0 C. Twenty milliliters of this culture was seeded into 1 L of LB medium with kanamycin, and grown at 37 0 C. At an OD 600 of 0.6, the culture was chilled on ice. After 5 minutes, the culture was induced with 0.3 mM IPTG and grown for 16 hours at 3O 0 C. Cells were harvested by centrifugation.
- the cultures were centrifuged in a bench-top centrifuge at 5,000 g for 20 minutes and the supernatant discarded.
- the cell pellets were typically frozen at -7O 0 C prior to further processing. Upon thawing, the cell pellets were suspended to approximately 80 optical density units (600 nm) in TBS (25 mM Tris, 150 mM NaCl, pH 7.8).
- TBS 25 mM Tris, 150 mM NaCl, pH 7.8
- the cells were lysed by two passes through an APV pressure homogenizer at 12-14,000 psi.
- the crude lysate was then heat-treated at 55°C for 2 hours.
- the lysate is centrifuged at 10,000 g for 30 minutes and the supernatant retained and filtered with a 0.2 ⁇ m vacuum filter (Corning).
- the PAL was purified from the clarified lysate by passage sequentially over a butyl 650M column (Tosoh BioSciences) and a MacroPrep High Q column (BioRad). The eluted product showed a high level of purity by both SDS PAGE and reverse phase HPLC.
- Rhodosporidium toruloides Rhodosporidium toruloides
- Similar methods are used for pegylation of prokaryotic PAL (e.g., Nostoc punctiforme (NpPAL) or Anabaena variabilis (AvPAL)) are described in EXAMPLE 6.
- NpPAL Nostoc punctiforme
- AvPAL Anabaena variabilis
- Pegylation uses modifications of literature methods (Hershfield, et al., (1991), ibid; U.S. Patent No. 6,057,292; Lu, et al, Biochemistry 40(44):13288-13301 (2001); Nektar Therapeutics, 2003 catalog).
- Activated PEGs include both the linear PEG succinimidyl succinates (mPEG-SPA, MW 5 kDa or MW 20 kDa) and the branched PEG hydrosuccinimides (mPEG 2 -NHS ester, MW 10 kDa or MW 40 kDa), which are both capped on one end with a methoxy group and available from Nektar Therapeutics; experimental determination of optimal pegylated proteins is normally required (Veronese, et al, J. Bioactive Compatible Polymers 12:196-207 (1997)).
- mPEG-SPA linear PEG succinimidyl succinates
- mPEG 2 -NHS ester MW 10 kDa or MW 40 kDa
- Optimal pegylation conditions are determined using different ratios of PAL:PEG (taking into account the molar ratio of protein along with the number of lysines per protein monomer), different pHs, different buffers, various temperatures and incubation times.
- High PAL protein:PEG derivatization ratios are necessary since native PAL has a large number of lysines (29 per Rhodosporidium toruloides (Rt) monomer) and because un-modified PAL displays immunoreactivity upon repeated injection in mice and since naked (wild-type) PAL is quickly inactivated upon exposure to proteases.
- Pegylation reactions are stopped by freezing at -20°C, and the samples will be analyzed by SDS-PAGE, MALDI-TOF mass spectroscopy, activity assessment, proteolytic sensitivity, and immunoreactivity.
- Protein concentration is determined using the PAL extinction coefficient (0.5 and 0.75 mg UiL -1 CIn '1 for RtPAL and AvPAL, respectively) at 280 nm for non-modified protein samples and for pegylated protein samples the concentration is calculated using the NI Protein Assay (GenoTechnology) that includes sample processing to remove non-protein contaminants that might interfere with accurate protein concentration determination.
- PAL extinction coefficient 0.5 and 0.75 mg UiL -1 CIn '1 for RtPAL and AvPAL, respectively
- PEG-PAL products are characterized by peptide mapping techniques to determine site-specific pegylation (LC/ESI-MSD), and trinitrobenzene sulfonate (TNBS) to determine the free amine titration before and after pegylation.
- Peptide mapping determines the relative occupancy of pegylation at a majority of the tryptic peptides that terminate with lysine, however, due to size and multiple adjacent lysine tryptic peptides, not all sites are visible using this technique.
- the TNBS assay more accurately defines the average number of PEG molecules per mol of enzyme, but gives no information about which sites get pegylated. For this reason, both assays are used and are complementary to each other.
- Rough estimates of percent derivatization of PAL products by PEG can be determined by SDS-PAGE and native gel analyses. Enzymatic assays are used to assess specific activity before and after pegylation and to provide evidence that there is no loss of the tetrameric PAL structure.
- the PAL activity assay is conducted using a Cary UV spectrophotometer (Cary 50) in the kinetics mode.
- the activity of PAL with L-phenylalanine substrate is assayed at room temperature (25°C) by measuring the production of trans-cinnamate monitored by the absorbance increase at 290 nra (Hodgins, (1968), ibid.).
- the molar extinction coefficient of trans-cinnamic acid at 290 nm is 10,238 liter M -1 Cm "1 .
- Reaction mixtures contain 22.5 mM phenylalanine in 100 mM Tris-HCl buffer, pH 8.5.
- PEG-PAL candidates are screened for immunoreactivity against antibodies raised by PKU mice injected with native PAL (non-pegylated) using three different and complementary techniques (Western blot, ELISA, and immunoprecipitation (IP)).
- PAL anti-serum from mice injected with native PAL
- the secondary antibody alkaline phosphatase-conjugated goat anti-mouse IgG (Promega)
- the ELISA test is performed using Nunc/Immuno Maxisorp plates (Nalge Nunc International) following standard procedures using 1 mg/mL of PAL in PBS and blocking with PBS, 0.05% Tween-20, 2% BSA.
- the mouse antisera (from native PAL exposed mice) is diluted 1 :10,000 in EB block solution (PBS, 0.05% Tween-20, 2% BSA), and a HRP-goat anti-mouse IgG is used as secondary antibody with TMB used for detection at 450 nm.
- Immunoprecipitation is used to test for PAL antibody binding. Protein samples (PAL or pegylated PAL) are incubated in TTBS buffer (Tris buffered saline with 0.1% Tween) and PAL activity is measured before adding the antibody sample. Each sample is incubated with 8-fold excess of positive control anti-PAL serum and a duplicate negative control reaction using non-immune mouse serum.
- protein G Sepharose 4 (50%, v/v) is added in excess, taking into account the mouse IgG binding capacity of the beads, and the samples are incubated again at 4°C overnight with rotation. Supernatants are recovered by centrifugation and the PAL activity of each sample is assayed on the supernatants. The bead pellets are not discarded, so that further analysis by Western blot can be performed. To confirm that antibody-bead binding has occurred, Western blot is used to detect the PAL antigen on the beads. Beads that have been recovered by centrifugation after the PAL binding step are washed several times with TTBS and TBS buffers.
- SDS-PAGE loading buffer is added to the beads and the samples are heated at 95°C for 5 minutes. Samples are then analyzed by Western blot using PAL anti-serum. Enzyme variants showing poor antibody binding have corresponding little PAL in the pelleted bead fractions as detected by Western blot and show higher activities remaining in the supernatant as compared to native un-modified PAL which displays high antibody binding.
- proteolytic sensitivity may reduce or eliminate proteolytic sensitivity and contribute to the development of an effective PKU enzyme substitute. However, elimination of such sites for proteolytic sensitivity may result in the reduction or loss of enzyme activity.
- Proteolytic stability will be assessed using incubation with a protease cocktail that approximates the intestinal environment and contains 2.3 mM trypsin, 3.5 mM chymotrypsin, 3.05 mM carboxypeptidase A, and 3.65 mM carboxypeptidase B.
- Proteolysis testing will involve enzymatic incubations, adding proteases to the PAL solutions, to determine the degree of protease sensitivity for the different protein variants being examined (native or mutant protein with or without pegylation or other chemical modification), including time courses of activity retention and stability retention after protease exposure.
- PEGylation for both NpPAL and AvPAL involves mixing the protein with SUNBRIGHT ME-200HS 20 kDa NHS-activated PEG (NOF).
- Protocol for PEGylation standard "HC” method using NHS-activated 20 kDa linear PEG:
- Endotoxin The protein was evaluated for the presence of endotoxin.
- a protein solution (0.1 mL) was diluted in 0.9 mL fresh MQ water and tested with a hand-held Charles River apparatus (EndoPTS) for endotoxin at the 0.5 ELVmL sensitivity level. If endotoxin was greater than 0.5 EU/mL, then endotoxin was reduced initially by Mustang E filtration, followed by Sterogene Etox resin, and less preferably by further chromatographic purification. Reduction was limited but sufficiently useful by passage over DEAE FF (Amersham) at pH 7.8.
- [00208] 2 Concentration and buffer exchange of protein.
- the protein was concentrated to greater than 25 mg/mL but less than or equal to 75 mg/mL and buffer exchanged to 50 mM KPO 4 , pH 8.5. If a spin filter was used to prepare this concentration, the filter was first tested for endotoxin by spinning at reduced speed and time (3000 rpm, 3 minutes) with buffer alone, then testing the retained buffer for endotoxin in the same way as the protein in step 1.
- the buffer batch record/recipe for 50 mM KPO4, pH 8.5 consisted of water (QS to 1 L), potassium phosphate dibasic (8.4913 g/L of 48.75 mM), and potassium phosphate monobasic (0.17011 g/L of 1.25 mM).
- the solution was filtered through a 0.2 ⁇ m filter and stored at room temperature.
- the concentrated product was slowly filtered (1-2 mL/min) through a Mustang E filter acrodisc.
- a sample diluted and blanked with sterile TBS, pH 7.5 was measured at A280 to determine protein concentration.
- the extinction coefficient was 0.83 for NpPAL and 0.75 for AvPAL.
- the formulation buffer recipe/batch record consisted of water (QS to 1 L), Tris-Base (3.2 mM), Tris-HCl (16.8 mM), and sodium chloride; the buffer solution was filtered through a 0.2 ⁇ m filter and stored at room temperature. The buffer solution was subjected to tangential flow filtration using a Vivaflow 50 (smaller lots) or Vivafiow 200 (larger lots) with a 100 MWCO regenerated cellulose membrane. The solution was flushed with MQ water, 0.1 N NaOH, and 200 mL water again. The solution was equilibrated with TBS, pH 7.5 at 50 mL/min cross-flow. The pH of the permeate was determined to ensure a pH of 7.5.
- the solution was buffer exchanged by first diluting with TBS approximately 3- fold and returning to original volume at least four times.
- Cross-flow was typically 180-200 mL/min for both Vivaflow 50 and 200.
- Amino acid substitutions were made in the AvPAL polypeptide to reduce aggregation that occurs in bacterially expressed, recombinant proteins. Protein aggregation may reduce enzyme activity and/or increase immunogenicity in vivo. One such form of aggregation occurs as a result of formation of inter-chain disulfide bonds. To minimize this possibility, various AvPAL cysteine residues, alone or in combination, were replaced with serine residues.
- the AvPAL polypeptide has 6 cysteine residues, at positions 64, 235, 318, 424, 503 and 565 (SEQ ID NO:4).
- the following AvPAL single cysteine mutants were generated: AvPAL_C64S (SEQ ID NO:7), AvPAL_C318S (SEQ ID NO:8), AvPAL_C503S (SEQ ID NO:9), and AvPAL_C565S (SEQ ID NO: 10).
- An AvPAL double cysteine mutant, AvPAL_S565SC503S (SEQ ID NO:11) was also generated.
- FIGURE 5A-5E shows the amino acid sequences of these AvPAL cysteine mutants.
- the AvPAL gene was amplified from Anabaena variabilis genomic DNA (ATCC 29413 -U, Qiagen DNeasy Kit) with forward primer AvarPALfor (5'-
- a 5' Nhel site was added and an internal Nhel site was removed by SOE-PCR.
- the upstream AvPAL fragment was amplified from lp40 with forward primer N-Nhe- AvPAL (5'-CACTGTGCTAGCATGAAGACACTATCTCAAGCACAAAG-S') (SEQ ID NO:20) and reverse primer Nhe-AvPALrev (5'-
- ACAGTGGCGGCCGCTTAATGCAAGCAGGGTAAGATATCTTG-S' (SEQ ID NO:23).
- the two PCR products were annealed and extended with DNA polymerase to produce the full-length AvPAL gene, and then amplified with primers N-Nhe- AvPAL and AvPALrev-r.
- the resulting PCR product was digested with NheI, blunted with Klenow, digested with NotI, and ligated into the pET28a+ vector (prepared by digestion with Ndel, blunting with Klenow, and digestion with NotI).
- the resulting plasmid was named 3p86-23.
- AvPAL was amplified from plasmid 3p86-23 with forward primer AvEcoRIfor (5'-
- AvPAL gene Two cysteine codons in the AvPAL gene, corresponding to positions 503 and 565 of the AvPAL polypeptide, were substituted with serine codons by site-directed mutagenesis (QuickChange XL II, Stratagene).
- the cysteine codon at position 503 was changed to a serine codon in plasmid 7p56 Av3 by PCR with forward primer Av_C503S (5'- GTCATTACGATGCACGCGCCTCTCTATCACCTGCAACTGAG-S') (SEQ ID NO:26) and reverse primer Av_C503Srev (5'-
- GCAGCCCGGGTTAATGCAAGGAGGGTAAGATATCTTGAACTG-S' (SEQ ID NO:29).
- the serine codon is underlined and the G to C mutation in the coding strand (C to G mutation in the non-coding strand) is indicated in bold.
- the resulting plasmid was named J298a.
- Cysteine codons in the AvPAL gene at positions 64, 318 and 565 of the AvPAL polypeptide were similarly substituted with serine codons using the following primer pairs: C64S, forward primer Av_C64S (5'- GCAGGGTATTCAGGCATCTTCTGATTACATTAATAATGCTGTTG-S') (SEQ ID NO:30) and reverse primer Av_C64Srev (5'-
- GCCCCAAATACTGGGGAAGGGATCGGAGTGAGTAACGATCTTG-S') (SEQ ID NO:33); and C565S, forward primer Av_C565S (SEQ ID NO:28) and reverse primer Av_C565Srev (SEQ ID NO:29).
- the serine codons are underlined, and the G to C mutations in the coding strands and the C to G mutations in the non-coding strands are indicated in bold.
- AvPAL variants ⁇ i.e., cysteine mutants) were cloned as described in EXAMPLE 7.
- the AvPAL cysteine mutant expression plasmids were transformed into bacteria and the AvPAL cysteine mutant polypeptides were expressed as described in EXAMPLE 1 and purified as described in EXAMPLE 2.
- Wild-type AvPAL and AvPAL cysteine mutants were prepared as described in EXAMPLE 8.
- the specific activities of the unpegylated AvPAL proteins were stable for at least 5 days at 37 0 C, and were not adversely affected by serine substitution of the cysteine residues at position 565, or at both positions 503 and 565.
- the specific activities of the pegylated AvPAL proteins were stable for at least 6 days at 37°C.
- the single cysteine AvPAL mutant, AvPAL_C565S showed somewhat reduced stability compared to wild-type AvPAL and the double cysteine AvPAL mutant, AvPAL_C565SC503S, after 6 days at 37°C.
- the purified AvPAL preparations were separated by gel electrophoresis under either denaturing conditions (4-12% NuPAGE Bis-Tris) or native conditions (8% Tris-Gly, pH 8.3).
- the separated AvPAL proteins were stained with Coomassie Blue.
- AvPAL proteins were loaded onto a TSK gel column (G3000SWxl, 7.8mm x 30 cm, 5 ⁇ m (Tosoh Bioscience, LLC)) in 20 raM Na-phosphate, 300 mM NaCl, pH 6.9, and eluted at a flow rate of 0.5 mL/min.
- the separated AvPAL proteins were analyzed on an Agilent series 1100 spectrometer.
- AvPAL proteins expressed in bacteria were purified as described in EXAMPLE 2, and concentrated using a spin filter (Millipore Biomax -10K NMWL). Proteins were spun at about 15,000 g for a few minutes in an Eppendorf Centrifuge 5415C. For cysteine mutants that tend to aggregate (e.g., AvPAL_C503S and AvPAL_C64S), proteins were concentrated to about 20 mg/mL and incubated for 2 hours at 37°C. For cysteine mutants that are resistant to aggregation (e.g., AvPAL_C565S and AvPAL_C565SC503S), proteins were concentrated to about 40 mg/mL and incubated for 2 hours at 37°C.
- AvPAL_C565S and AvPAL_C565SC503S proteins were concentrated to about 40 mg/mL and incubated for 2 hours at 37°C.
- AvPAL preparation was denatured in the presence of 8 M urea, alkylated by iodoacetamide, digested with trypsin, and analyzed by LC/MS. All of the AvPAL cysteine residues were labeled by iodoacetamide, indicating that all of the cysteine residues of bacterially expressed AvPAL exist as free sulfhydryls (data not shown).
- cysteine residues are present on the surface of the native protein.
- a purified AvPAL preparation was first treated with N-ethylmaleimide (NEM), then denatured in the presence of 8 M urea, alkylated by iodoacetamide, digested with trypsin, and analyzed by LC/MS.
- the cysteine residues at positions 235 and 424 were not alkylated by NEM, and the cysteine residue at position 318 was only partially alkylated by NEM, indicating that the cysteine residues at positions 64, 503 and 565 are on the surface of native AvPAL and the cysteine residue at position 318 is partially exposed on the surface of native
- AvPAL (data not shown).
- 67 ⁇ L of a 0.7 mg/mL solution of purified, unpegylated wild-type AvPAL preparation was denatured and alkylated in 8 M urea containing 20 mM iodoacetamide for 1 hour at 37 0 C, and then digested in a 100 ⁇ L reaction volume with trypsin at pH 8.2 overnight (-17.5 hours) at 25 0 C.
- the trypsin-digested proteins were separated and analyzed by mass spectrometry, in which peptides corresponding to the predicted disulfide pairs were identified and quantitated as total ion counts (TIC).
- Table 3 shows that disulfide pairs were detected for C503-C503, C503-C565, C565-C318 and C565-C565.
- AvPAL preparations were incubated with either 0.05% Tween or 10 mM EDTA, and then separated by SEC-HPLC as described in EXAMPLE 9.
- Tween reduces protein aggregation due to hydrophobic interactions
- EDTA reduces protein aggregation due to the presence of divalent cations.
- FIGURE 9 exposure to 0.05% Tween or 10 mM EDTA had no effect on AvPAL protein aggregation.
- the additional peak at 10 minutes in the 10 mM EDTA treated AvPAL is due to absorbance of EDTA at 210 nm.
- AvPAL protein aggregation was reduced by treatment with DTT and then desalted prior to separation by SEC-HPLC.
- AvPAL protein aggregation was minimized by treatment with DTT, and aggregates re-formed following incubation for 18 hours at 37°C.
- aggregates did not re-form once the AvPAL surface cysteines were modified (i.e., alkylated) by treatment with N- methylmaleimide (NEM) after DTT exposure, but before desalting and incubation for 18 hours at 37°C.
- NEM N- methylmaleimide
- purified pegylated AvPAL_C565SC503S was diluted in TBS dilution buffer plus BSA/Phe/Brij and then added to an assay buffer containing 22.5 mM Phe, 100 mM Tris-HCl, pH 8.5. After incubation for 10-20 minutes at 30 0 C, the amount of trans-cinnamic acid (t-CA) released was measured by absorbance at 290 nm. One IU of PAL activity is equal to 1 ⁇ Mol TCA/min.
- FIGURE 11 A summary of the accelerated stability studies 1, 2 and 3 is shown in FIGURE 11.
- nucleophilic scavengers as excipient on stability of the pegylated AvPAL double cysteine mutant AvPAL_C565SC503S was evaluated.
- Purified pegylated AvPAL_C565SC503S at approximately 20 mg/mL (0.33 mM) was pre-formulated in 10 mM Tris and 140 mM NaCl at pH 7.5 in the absence or presence of 1 Phe (substrate at 3 moles per mole active site), 2 mM nucleophilic scavenger (either benzoic acid or pyridoxamine at 6 moles per mole active site), or both 1 mM Phe and 2 mM nucleophilic scavenger.
- shelf-life was determined as follows: (1) determining the rate of activity decay (k deca y), which followed first order kinetics, for each formulation condition; (2) plotting the ln(k deca y) v.
- the pegylated AvPAL double cysteine mutant AvPAL_C565SC503S was formulated as follows: (Fl) 10 mg/mL AvPAL_C565SC5O3S, 10 mM Tris, pH 7.5; (F2) 10 mg/mL AvPAL_C565SC503S, 10 mM Tris, pH 7.5, 25 mg/mL mannitol; or (F3) 10 mg/mL AvPAL_C565SC503S, 10 mM Tris, pH 7.5, 20 mg/mL mannitol, 5 mg/mL sucrose. After formulation, the PAL enzyme activity of each was 1.7 to 1.8 U/mg.
- Toxicity/pharmacokinetic studies were performed to determine the effect of administration of a single dose of a PEGylated form of an AvPAL polypeptide variant (e.g., with serine substitution of the cysteine residues at positions 503 and 565) in Cynomolgus monkeys and in rats.
- a PEGylated form of an AvPAL polypeptide variant e.g., with serine substitution of the cysteine residues at positions 503 and 565
- This study used four (4) groups of monkeys, each with three males and three females.
- Group 1 received placebo (mL/kg); and
- Groups 2, 3 and 4 received a single subcutaneous injection of pegylated AvPAL double cysteine mutant AvPAL_C565SC503S in solution at 4, 12 and 60 mg/kg, respectively.
- Plasma samples were collected from the monkeys pre-dose, and at various times post-dose, from 3 to 504 hours. The 60 mg/kg dose was found to be toxic to the monkeys, so the Group 4 portion of this study was terminated.
- FIGURE 14A shows the concentration of pegylated AvPAL double cysteine mutant AvPAL_C565SC503S in the plasma at various times after a single subcutaneous injection at 4 and 12 mg/kg.
- the data shows monophasic elimination of the pegylated AvPAL double cysteine mutant AvPAL_C565SC503S.
- a single compartment model with 1 st order absorption appears to describe the plasma profile of the pegylated AvPAL double cysteine mutant AvPAL_C565SC503S after a single subcutaneous injection.
- FIGURE 14B shows the concentrations of phenylalanine (Phe) and pegylated AvPAL double cysteine mutant AvPAL_C565SC503S in the plasma at various times after a single subcutaneous injection at 4 mg/kg. At this dose, the plasma Phe concentration was reduced to below the limit of quantitation in the GC/MS assay within 24 hours, and the drop in plasma Phe was sustained over 10 days.
- This study used eight (8) groups of rats, with 3 males and 3 females in the placebo groups, and 6 males and 6 females in the test groups.
- Groups 1 and 5 received single intravenous and subcutaneous injections of placebo.
- Groups 2, 3 and 4 received single intravenous injections of pegylated AvPAL double cysteine mutant AvPAL_C565SC503S at 1, 5 and 25 mg/kg, respectively.
- Groups 6, 7 and 8 received single subcutaneous injections of pegylated AvPAL double cysteine mutant AvPAL_C565SC503S at 10, 25 and 250 mg/kg, respectively.
- Blood samples were collected from the rats pre-dose, and at various times post- dose, from 1 to 360 hours. At each collection time, blood was collected from 3 rats in each group. No toxicity was observed in the rats in this study.
- FIGURE 15A shows the concentration of pegylated AvPAL double cysteine mutant AvPAL_C565SC503S in the plasma at various times after a single intravenous injection at 1, 5 and 25 mg/kg.
- the data shows monophasic elimination of the pegylated AvPAL double cysteine mutant AvPAL_C565SC503S from the plasma after a single intravenous injection.
- FIGURE 15B shows the concentration of pegylated AvPAL double cysteine mutant AvPAL_C565SC503S in the plasma at various times after a single subcutaneous injection at 10, 25 and 250 mg/kg.
- a single compartment model with first order absorption appears to describe the plasma profile of the pegylated AvPAL double cysteine mutant AvPAL_C565SC503S after a single subcutaneous injection.
- Table 6 shows pharmacokinetic parameters of the pegylated AvPAL double cysteine mutant AvPAL_C565SC503S after a single intravenous or subcutaneous injection.
- terminal tm is longer than intravenous; this may be due to a slower rate of absorption from subcutaneous tissues than the rate of elimination (so that the Xm observed is actually absorption), bioavailability using intravenous AUC data at 25 mg/kg is 21.5%.
- a panel of twenty-four (24) hematological tumor cell lines including 14 leukemias, 5 lymphomas and 5 myelomas, were evaluated for the effect of pegylated double cysteine mutant AvPAL_C565SC503S on cell proliferation in vitro.
- the hematological tumor cell lines were seeded into culture plates at 5,000 cells/well on Day 0. On Day 1, pegylated double cysteine mutant AvPAL_C565SC503S was added to the cultures at various concentrations, from 0.01 to 100 ⁇ g/mL. On Day 5, cells were harvested and DNA content was measured by propidium iodide staining. The IC 50 , IC 70 and IC 90 were determined. These experiments were performed twice or three times for each hematological tumor cell line.
- Table 7 shows that pegylated double cysteine mutant AvPAL_C565SC503S was effective in inhibiting in vitro proliferation, as measured by propidium iodide staining, of several hematological tumor cell lines.
- FIGURE 14A and 2 IB Dose-dependent inhibition of cell proliferation, as determined by a reduction in propidium iodide staining, by the pegylated double cysteine mutant AvPAL_C565SC503S in two sensitive hematological tumor cells, NOMOl and IM9, are shown in FIGURE 14A and 2 IB, respectively. These tumor cell lines had IC 50 and IC 7O of less than 1.0 and 10.0 ⁇ g/mL, respectively. For comparison, asparaginase has an IC 50 of 1-10 ⁇ g/mL in human leukemia cell lines. In general, however, the hematological tumor cell lines were more resistant, as judged by IC 7O values, than the solid tumor lines (see below).
- a panel of thirty-six (36) solid tumor cell lines including tumors derived from bladder, brain, colon, stomach, head and neck, lung, breast, ovary, pancreas, prostate, kidney and uterus, were evaluated for the effect of pegylated double cysteine mutant AvPAL_C565SC503S on cell proliferation in vitro.
- the solid tumor cell lines were seeded into culture plates at 5,000 cells/well on Day 0.
- pegylated double cysteine mutant AvPAL_C565SC503S was added to the cultures at various concentrations, from 0.01 to 100 ⁇ g/mL.
- DNA content was measured by propidium iodide staining.
- the IC 50 , IC 70 and IC 90 were determined.
- Table 8 shows that pegylated double cysteine mutant AvPAL_C565SC503S was effective in inhibiting in vitro proliferation, as measured by propidium iodide staining, of several solid tumor cell lines.
- Table 8 Inhibition of Propidium Iodide Staining of Solid Tumor Lines In Vitro by Pegylated Double Cysteine Mutant AvPAL_C565SC503S
- the AvPAL_C565SC503S displayed a selective antiproliferative activity in this broad panel of solid tumor cell lines, and was particularly potent (i.e., IC 50 between 0.2 and 0.7 ⁇ g/mL) in tumor cell lines derived from lung, brain/CNS, colon, prostate and kidney. At least on tumor cell line derived from bladder, head and neck, breast, ovary and uterus were also sensitive to cell killing by AvPAL_C565SC503S. Several melanomas were also sensitive to cell killing by AvPAL_C565SC503S.
- AvPAL double cysteine mutant AvPAL_C565SC503S is prepared as described in EXAMPLE 7.
- Subcutaneous xenografts of human tumor cells in immunodeficient nude or SCID mice have been successfully used as models for human cancers to test the in vivo efficacy of cancer therapeutic agents as well as targeted cancer therapeutic agents, such as antibodies and toxin conjugates (for review, see Kerbel, Cancer Biol. Ther. 2(4):Suppl. 1 :S134-S139 (2003)).
- the in vivo antitumor activity of the pegylated AvPAL double cysteine mutant AvPAL_C565SC503S can be tested alone or in combination with cancer therapeutic agents or targeted cancer therapeutic agents, or in combination with a phenylalanine-restricted diet, using xenografts of human tumor cells in nude mice.
- nude mice are injected subcutaneously with about 5 x 10 6 human tumor cells in 0.2 mL PBS. The average tumor size increases over time.
- Human xenograft tumors are excised from the tumor bearing nude mice and tumor tissue blocks of approximately 30 mm 3 are prepared.
- Naive nude mice to be used for evaluating in vivo antitumor activity of pegylated AvPAL double cysteine mutant AvPAL_C565SC503S are each implanted subcutaneously with one tumor tissue block.
- Therapeutic treatment is initiated before tumor initiation or when the average tumor size within a group of nude mice is approximately 100-150 mm 3 (prevention model), and/or after the establishment of tumors when the average tumor size within a group of nude mice is above 500 mm 3 (treatment model).
- a first step the dose of pegylated AvPAL double cysteine mutant AvPAL_C565SC503S that will lower plasma phenylalanine (Phe) levels to near zero is determined. Experiments are performed such as those described in Examples 7 to 9 and 14 in prior co-pending United States Patent Application Number 11/451,999 filed on June 12, 2006, except nude mice rather than ENU2 mice are used. The PAL enzyme dose and the frequency of administration are determined in this initial step.
- the anti-tumor activity of pegylated AvPAL double cysteine mutant AvPAL_C565SC503S is assessed in various human tumor xenografts derived from patients or cell lines.
- Tumor models include different cancer types, for example and not for limitation, central nervous system (CNS), colon, lung, prostate, metastatic melanoma and renal cancer.
- CNS central nervous system
- Non-comprehensive lists of tumors and tumor cell lines that can be tested are provided in Tables 7 (hematological tumors) and 8 (solid tumors).
- nude mice bearing different human tumor xenografts subcutaneously are treated with AvPAL_C565SC503S given subcutaneously at, e.g., three different dose levels, ranging from about 5 to 500 mg/kg. This dose may result in a human dose of about 0.1 to 10 mg/kg.
- Antitumor activity is analyzed as tumor volume inhibition and/or absolute growth delay.
- the tolerability of the AvPAL_C565SC503S is also evaluated as mortality and/or body weight changes.
- Each in vivo antitumor study consists of at least four groups, one vehicle control group and at least three prokaryotic PAL enzyme-treated groups.
- the group size will be at least 8 mice, resulting in a total of 32 mice receiving subcutaneous tumor implantations. Mice with similar sized tumors (100-150 mm 3 ) will be used for randomization (Day 0).
- mice may be monitored for additional 2 weeks after termination of prokaryotic PAL enzyme treatment to detect a possible reinitiation of tumor growth. According to regulations for animal experiments, mice are sacrificed if the tumor diameters exceed 1.6 cm.
- Tumor diameters are measured twice weekly together with body weight.
- Tumor volume is calculated according to the formula a*bV2 (where 'a' is the largest diameter of the tumor and 'b' is the perpendicular axis).
- Relative tumor volumes and body weights are calculated for each individual tumor based on the value on Day 0 (the first day of dosing). Treatment starts when the tumors have reached a volume of approximately 100-150 mm 3 . Mice are sacrificed if the tumor volume exceeds 1600 mm 3 , per regulations for animal studies.
- Patient-derived tumors established in serial passage in nude mice can also be used as test tumors. Typically, these tumors retain important characteristics of the original patient tumor, including histology and drug sensitivity. For certain tumors, e.g., one CNS and both prostate cancers, cancer cell line-derived tumors are used.
- compositions comprising prokaryotic PAL or biologically active fragments, mutant, variants or analogs thereof, which are useful for treatment of neoplastic disease and cancer.
- Parameters to be used to formulate prokaryotic PAL compositions of the invention include, but are not limited to, buffering agents to maintain pH, isotonicity-adjusting agents, absence or presence of stabilizers, and absence or presence of other excipients, vehicles, diluents, and the like.
- the pegylated AvPAL double cysteine mutant AvPAL_C565SC503S was formulated at a concentration of about 12-20 mg/mL (about 0.2- 0.33 raM).
- a preferred prokaryotic PAL variant is formulated at a concentration ranging from about 1 to 50 mg/mL (about 0.016 to 0.8 mM), preferably from about 5 to 20 mg/mL (about 0.08 to 0.33 mM), and more preferably from about 5 to 15 mg/mL (about 0.08 to 0.25 mM).
- a most preferred formulation of the prokaryotic PAL compositions of the invention has a PAL enzyme concentration of about 10 +/- 5 mg/mL (about 0.16 +/- 0.08 mM).
- the pegylated AvPAL double cysteine mutant AvPAL_C565SC503S was formulated in 10 mM Tris-HCl, 140 mM NaCl at pH 7.0, 7.5 and 8.0.
- a preferred buffering agent is Tris-HCl, or its equivalent, with a concentration ranging from 5 to 50 mM, preferably from 5 to 20 mM, and more preferably from 5 to 15 mM.
- a most preferred formulation of the prokaryotic PAL compositions of the invention has a Tris- HCl buffer concentration of about 10 +/- 5 mM.
- a preferred pH of the pharmaceutical composition is about pH 6.0-8.5, preferably about pH 7.0-8.0, and more preferably about pH 7.0-7.6.
- a most preferred formulation of the prokaryotic PAL compositions of the invention has a pH of about pH 7.3 +/- 0.3.
- a preferred isotonicity-adjusting agent is NaCl, or its equivalent, with a concentration ranging from about 100 to 200 mM, preferably from about 130 to 170 mM, and more preferably from about 130 to 150 mM.
- a most preferred formulation of the prokaryotic PAL compositions of the invention has a NaCl concentration of about 140 +/- 10 mM.
- the pegylated AvPAL double cysteine mutant AvPAL_C565SC503S was stabilized in the presence of phenylalanine (Phe), and certain of its structural analogs, including, for example, trans-cinnamic acid (t-CA) and benzoic acid; tyrosine (Tyr) had a minimal stabilizing effect on the PAL enzyme.
- Phe phenylalanine
- t-CA trans-cinnamic acid
- Teyr tyrosine
- a preferred stabilizer is Phe, or structural analog thereof, with a range for the stabilizer from about 0.1 to 20 moles of stabilizer per mole active site of prokaryotic PAL, preferably from about 0.5 to 10 moles of stabilizer per mole active site of prokaryotic PAL, and more preferably from about 1 to 10 moles of stabilizer per mole active site of prokaryotic PAL.
- a most preferred formulation of the prokaryotic PAL compositions of the invention has a stabilizer concentration of about 5 +/- 4 moles of stabilizer per mole active site of prokaryotic PAL.
- the pegylated AvPAL double cysteine mutant AvPAL_C565SC503S was not significantly stabilized at pH ⁇ 7 or pH > 7.6, or in the presence of EDTA, aminoguanidine or Tween 80; the anti-oxidants ascorbic acid and methionine destabilized the PAL enzyme (EXAMPLE 11 and data not shown).
- the prokaryotic PAL compositions of the invention are preferably made as liquid formulations, but may also be prepared as solid (e.g., lyophilized) formulations. In such case, excipients, e.g., bulking agents, such as mannitol and/or sucrose, may be added.
- the pegylated AvPAL double cysteine mutant AvPAL_C565SC503S was formulated and lyophilized in 10 mM Tris-HCl, 140 mM NaCl at pH 7.5 in the absence of mannitol or sucrose, in the presence of 25 mg/mL mannitol, or in the presence of 20 mg/mL mannitol plus 5 mg/mL sucrose.
- a preferred lyophilized formulation comprises mannitol at a concentration from about 1 to 5% (w/v) or 10 to 50 mg/mL, preferably from about 2 to 4%, and more preferably from about 2 to 3%.
- Another preferred lyophilized formulation comprises mannitol and sucrose, with a concentration of mannitol from about 1 to 5% (w/v) or 10 to 50 mg/mL, preferably from about 1 to 3%, and more preferably from about 1.5 to 2.5%, and a concentration of sucrose from about 0.1 to 2% (w/v) or 0.1 to 2 mg/mL, preferably from about 0.2% to 1%, and more preferably from about 0.3% to 0.7%.
- a most preferred lyophilized formulation of the prokaryotic PAL compositions of the invention has a mannitol concentration of about 2.5 +/- 0.5% mannitol or 2.0 +/- 0.5% mannitol plus 0.5 +/- 0.2 % sucrose.
- prokaryotic PAL compositions will be used in the treatment of cancer.
- Clinical trials will be conducted which will provide an assessment of oral or subcutaneous doses of prokaryotic PAL for safety, pharmacokinetics, and initial response of both surrogate and defined clinical endpoints. The trial will be conducted for a minimum, but not necessarily limited to, 24 weeks to collect sufficient safety information for 100 evaluable patients. The initial dose for the trials will vary from about 0.001 to about 1.0 mg/kg/week.
- this dose does not produce a reduction in plasma phenylalanine (Phe) levels in a patient, e.g., a reduction from the normal range about 50 ⁇ M to about 70 ⁇ M to a range from below the level of detection to less than about 30 ⁇ M, preferably less than about 20 ⁇ M, and even more preferably less than about 10 ⁇ M, the dose should be increased as necessary, and maintained for an additional minimal period of, but necessarily limited to, 24 weeks to establish safety and to evaluate further efficacy.
- Phe plasma phenylalanine
- Measurements of safety will include adverse events, allergic reactions, complete clinical chemistry panel (kidney and liver function), urinalysis, and CBC with differential.
- other parameters including the reduction in levels of blood Phe levels, neuropsychological and cognitive testing, and global assessments also will be monitored.
- the present example also contemplates the determination of pharmacokinetic parameters of the drug in the circulation, and general distribution and half-life of PAL in blood. It is anticipated that these measures will help relate dose to clinical response.
- Cancer- free control patients and patients who have been diagnosed with a form of cancer will undergo a baseline a medical history and physical exam, neuropsychological and cognitive testing, a standard set of clinical laboratory tests (CBC, Panel 20, CH50, UA), levels of urinary pterins, dihydropteridine reductase (DHPR) levels, and a fasting blood (plasma) panel of serum amino acids. Baseline blood, serum or plasma Phe levels will be measured. The patient will be followed closely with weekly visits to the clinic. Patients will return to the clinic for a complete evaluation one week after completing the treatment period. Should dose escalation be required, the patients will follow the same schedule outlined above. Safety will be monitored throughout the trial. Diagnosis and Inclusion/Exclusion Criteria
- the patient may be male or female, with a documented diagnosis of a form of cancer.
- the study will include cancer patients who have previously undergone surgery, chemotherapy, radiation therapy and/or other anti-cancer therapy and are in remission (e.g., disease-free for at least 5 years).
- a patient will be excluded from this initial study if the patient has been diagnosed with a form of cancer, but has not undergone some form of anticancer therapy.
- Prokaryotic PAL therapy will be determined to be safe if no significant acute or chronic drug reactions occur during the course of the study. The longer-term administration of the drug will be determined to be safe if no significant abnormalities are observed in the clinical examinations, clinical labs, or other appropriate studies.
- prokaryotic PAL therapy has been determined to be safe and effective to reduce the plasma phenylalanine (Phe) levels in a patient, e.g. , a reduction from the normal range about 50 ⁇ M to about 70 ⁇ M to a range from below the level of detection to less than about 30 ⁇ M, preferably less than about 20 ⁇ M, and even more preferably less than about 10 ⁇ M
- the prokaryotic PAL compositions of the invention can be tested in cancer patients who have previously undergone surgery, chemotherapy, radiation therapy and/or other anti-cancer therapy and are in remission (e.g., disease-free for at least 5 years), as well as in patients who have been diagnosed with a form of cancer, but have not as yet undergone any form of anticancer therapy.
- prokaryotic PAL is administered, alone or in combination with standard cancer therapy for the particular form of cancer, to determine whether patients given the PAL therapy remain in remission (i.e., disease-free) for a longer period of time than patients not given prokaryotic PAL compositions of the invention.
- prokaryotic PAL is administered, alone or in combination with standard cancer therapy for the particular form of cancer, to determine whether patients given the PAL therapy have a better response to the cancer therapy (e.g., remain disease-free longer, have longer survival time, or have lower tumor growth, tumor size or tumor burden) than patients not given prokaryotic PAL compositions of the invention.
- Prokaryotic PAL therapy can be administered alone, or in combination with a cancer therapeutic agent or targeted cancer therapeutic agent, or with a protein-restricted diet (i.e., phenylalanine-free), or both.
- a cancer therapeutic agent or targeted cancer therapeutic agent or with a protein-restricted diet (i.e., phenylalanine-free), or both.
- a protein-restricted diet i.e., phenylalanine-free
- mice were injected subcutaneously with about 1 x 10 6 Bl 6 melanoma tumor cells into the hind flank. Injected mice were randomly assigned into two groups, representing prophylactic treatment and therapeutic treatment cohorts.
- mice assigned to the prophylactic group were further divided into four groups, each group receiving two subcutaneous injections weekly of vehicle (10 mM Tris-HCl, 140 mM NaCl, 1 mM trans-cinnamic acid (t-CA), pH 7.5) or pegylated AvPAL double cysteine mutant AvPAL_C565SC503S at different dose levels (40, 80 or 100 mg/kg).
- Day 1 in the prophylactic group indicates the day that B16 melanoma cells were injected into the mice, as indicated in FIGURE 18 (top).
- Day 1 indicates the day that B 16 melanoma tumors injected into the mice reached 200-300 mm 3 in volume, as indicated in FIGURE 18 (bottom).
- these mice were further divided into four groups, each group receiving two subcutaneous injections weekly of vehicle (10 mM Tris-HCl, 140 mM NaCl, 1 mM t-CA, pH 7.5) or pegylated AvPAL double cysteine mutant AvPAL_C565SC503S at different dose levels (40, 80 or 100 mg/kg) in the flank opposite to the tumor.
- vehicle 10 mM Tris-HCl, 140 mM NaCl, 1 mM t-CA, pH 7.5
- pegylated AvPAL double cysteine mutant AvPAL_C565SC503S at different dose levels (40, 80 or 100 mg/kg) in the flank opposite to the tumor.
- mice All mice were palpated daily until tumors were measurable. Tumor volume was determined three times per week by digital caliper measurement using the formula (/ X w 2 )/2, where w is the shortest of 2 perpendicular axes of the tumor
- Body weights were measured three times per week, and clinical observations (mortality, abnormalities, and signs of pain or distress) were conducted daily. Blood collections via retro-orbital sinus collection was performed weekly prior to dose administration (day 1 of each week), 48-hours post-dose (day 3 of each week) and at termination.'
- mice were terminated at day 36 or individually when tumors reached 1500 mm 3 in volume, whichever occurred first. Tumors were harvested at termination and formalin fixed for histological examination.
- mice in the prophylactic group had a tumor volume of 1500 mm 3 by day 16 (see FIGURE 18 (top)). Some mice in the treatment group had a tumor volume of 1500 mm 3 by day 10 (see FIGURE 18 (bottom)).
- FIGURE 18 shows that the pegylated AvPAL double cysteine mutant AvPAL_C565SC503S was able to delay growth of the B16 melanoma cell line xenograft in a dose-dependent manner when the enzyme was administered prophylactically (top) or therapeutically (bottom).
- Table 10 shows that the pegylated AvPAL double cysteine mutant AvPAL_C565SC503S was able to increase survival, as determined by the percentage of mice with a tumor volume less than 1500 mm , in a dose-dependent manner when the enzyme was administered prophylactically or therapeutically.
- Table 10 Effect of rAVPAL-PEG_C565SC503S on Survival in a B16 Melanoma Tumor
- prophylactic dosing of pegylated AvPAL double cysteine mutant AvPAL_C565SC503S, prepared as described in EXAMPLE 7 and formulated at 9.1 mg/mL in 10 mM Tris-HCl, 140 mM NaCl, 1 mM trans-cinnamic acid (t- CA), pH 7.5, were evaluated in two hepatoma tumor cell line xenograft models.
- Prophylactic treatment means a treatment administered to a subject who does not exhibit signs of disease.
- Anti -tumor efficacy of prophylactic treatment with the pegylated AvPAL variant was measured by delay in growth of the hepatoma xenografts and by increase in survival time of the mice.
- 20 six-week old female B6J mice were injected subcutaneously with about 1 x 10 7 SNU398 hepatoma tumor cells or with about 5 x 10 6 HepG2 hepatoma tumor cells into the hind flank.
- mice were each divided into two groups, each group receiving three subcutaneous injections weekly of vehicle (10 mM Tris- HCl, 140 mM NaCl, 1 mM trans-cinnamic acid (t-CA), pH 7.5) or pegylated AvPAL double cysteine mutant AvPAL_C565SC503S at 60 mg/kg.
- Day 1 indicates the day that SNU398 cells or HepG2 cells were injected into the mice, as indicated in FIGURE 19.
- mice All mice were palpated daily until tumors were measurable. Tumor volume was determined three times per week by digital caliper measurement using the formula (/ X w 2 )/2, where w is the shortest of 2 perpendicular axes of the tumor.
- Body weights were measured three times per week, and clinical observations (mortality, abnormalities, and signs of pain or distress) were conducted daily. Blood collections via retro-orbital sinus collection was performed pre-study, 48-hours following the 7 th dose and at termination.
- mice were terminated at day 60 or individually when tumors reached 1500 mm 3 in volume, whichever occurred first. Tumors were harvested at termination and formalin fixed for histological examination.
- FIGURE 19 shows that the prophylactic administration of the pegylated AvPAL double cysteine mutant AvPAL_C565SC503S was able to delay growth of the SNU398 (top) and HepG2 (bottom) hepatoma cell line xenografts.
- Table 11 shows that the prophylactic administration of the pegylated AvPAL double cysteine mutant AvPAL_C565SC503S was able to increase survival as determined by the percentage of mice with a tumor volume less than 1500 mm 3 of the SNU398 and HepG2 hepatoma cell line xenografts.
- Table 11 Effect of rAVPAL-PEG_C565SC503S on Survival in Two Hepatoma Tumor
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JP2013518893A (ja) * | 2010-02-04 | 2013-05-23 | ビオマリン プハルマセウトイカル インコーポレイテッド | 原核生物フェニルアラニンアンモニアリアーゼ変異体の組成物、及び、その組成物を用いる方法 |
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US11505790B2 (en) | 2010-02-04 | 2022-11-22 | Biomarin Pharmaceutical Inc. | Compositions of prokaryotic phenylalanine ammonia-lyase variants and methods of using compositions thereof |
US11918633B2 (en) | 2021-05-19 | 2024-03-05 | Biomarin Pharmaceutical Inc. | Compositions of prokaryotic phenylalanine ammonia-lyase and methods of treating adolescent subjects |
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